CN115130075A

CN115130075A - Digital signature method and device, electronic equipment and storage medium

Info

Publication number: CN115130075A
Application number: CN202210754114.XA
Authority: CN
Inventors: 栗志果
Original assignee: Ant Blockchain Technology Shanghai Co Ltd
Current assignee: Ant Blockchain Technology Shanghai Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-09-30

Abstract

The embodiment of the specification provides a digital signature method, a digital signature device, electronic equipment and a storage medium. The method comprises the following steps: a first terminal acquires digital signature operation which is initiated by a user and aims at a target digital file to be signed; and responding to the digital signature operation, the first terminal acquires the identity information of the user and carries out short-distance wireless communication with a second terminal maintaining the target digital file so as to transmit the identity information of the user to the second terminal, so that the second terminal takes the identity information of the user as a calling parameter, calls an intelligent contract which is arranged on a block chain and used for signing and sealing the digital file, and signs and seals the target digital file based on a digital seal corresponding to the identity information of the user.

Description

Digital signature method and device, electronic equipment and storage medium

Technical Field

One or more embodiments of the present disclosure relate to the field of block chain technologies, and in particular, to a digital signature method, an apparatus, an electronic device, and a storage medium.

Background

For individuals, enterprises and various institutions, the entity seal held by the individual, enterprise and various institutions can be used to perform signature processing on related documents, that is, a seal image corresponding to the entity seal can be added on a paper document, and a signature can be handwritten to show the authenticity and correctness of the document approved by the seal holder or the signer.

In order to improve the efficiency of signature processing, with the advance of informatization office, the circulation form of paper documents is changed into the circulation form of digital documents, digital seals (also called electronic seals) are generated at the same time, and users can call the digital seals to perform signature processing on the digital documents.

However, when a user uses one terminal device to manage a digital seal related to the terminal device, a very complicated interaction flow is often required to be executed when a digital file to be signed maintained by another terminal device needs to be signed. Therefore, in the above scenario, how to improve the efficiency of digital signature and improve the user experience of digital signature becomes an urgent problem to be solved.

Disclosure of Invention

The application provides a digital signature method, which is applied to a first terminal for initiating digital signature; the method comprises the following steps:

acquiring a digital signature operation initiated by a user and aiming at a target digital file to be signed;

and responding to the digital signature operation, acquiring the identity information of the user, performing short-distance wireless communication with a second terminal maintaining the target digital file, transmitting the identity information of the user to the second terminal, taking the identity information of the user as a calling parameter by the second terminal, calling an intelligent contract which is arranged on a block chain and used for signing and sealing the digital file, and signing and sealing the target digital file based on a digital seal corresponding to the identity information of the user.

Optionally, the digital signature operation includes an operation that the user holds the first terminal close to the second terminal.

Optionally, the second terminal is equipped with a touch display screen; the target digital file is output and displayed to the user through the touch display screen;

the digital signature operation comprises the operation that the user holds the first terminal and contacts a touch display screen carried by the second terminal;

the method for performing short-distance wireless communication with a second terminal maintaining the target digital file to transmit the identity information of the user to the second terminal so that the second terminal takes the identity information of the user as a calling parameter, calls an intelligent contract which is deployed on a block chain and used for signing and sealing the digital file, and signs and seals the target digital file based on a digital seal corresponding to the identity information of the user includes:

and carrying out short-distance wireless communication with a second terminal maintaining the target digital file so as to transmit the identity information of the user to the second terminal, so that the second terminal takes the touch point of the first terminal on a touch display screen carried by the second terminal and the identity information of the user as calling parameters, calls an intelligent contract which is arranged on a block chain and used for signing and processing the digital file, and carries out signing and processing on a position, corresponding to the touch point, in the target digital file which is output and displayed to the user through the touch display screen based on a digital seal corresponding to the identity information of the user.

Optionally, the short-range wireless communication comprises near field communication, NFC.

The application also provides another digital signature method which is applied to a second terminal maintaining a target digital file to be signed; the method comprises the following steps:

receiving identity information of a user, which is transmitted by a first terminal in response to a digital signature operation initiated by the user and aiming at the target digital file, and is in short-distance wireless communication with a second terminal;

and responding to the identity information of the user transmitted by the first terminal, taking the identity information of the user as a calling parameter, calling an intelligent contract which is deployed on a block chain and used for signing and sealing a digital file, and signing and sealing the target digital file based on a digital seal corresponding to the identity information of the user.

the step of taking the identity information of the user as a calling parameter, calling an intelligent contract which is deployed on a block chain and used for signing and processing a digital file, and signing and processing the target digital file based on a digital seal corresponding to the identity information of the user comprises the following steps:

and taking a touch point of the first terminal on a touch display screen carried by the second terminal and the identity information of the user as calling parameters, calling an intelligent contract which is deployed on a block chain and used for signing a digital file, and signing the signature on a position corresponding to the touch point in the target digital file which is output and displayed to the user through the touch display screen based on a digital seal corresponding to the identity information of the user.

Optionally, the step of taking a touch point of the first terminal on a touch display screen mounted by the second terminal and the identity information of the user as a calling parameter, calling an intelligent contract which is deployed on a blockchain and used for signing a digital file, and based on a digital seal corresponding to the identity information of the user, signing a signature at a position corresponding to the touch point in the target digital file which is output and displayed to the user through the touch display screen includes:

generating authorization information used for indicating that the target digital file is signed and sealed based on the digital seal of the user;

the authorization information is signed based on the private key of the user, the signed authorization information is used as a calling parameter and is further submitted to an intelligent contract which is deployed on the block chain and used for signing a digital file, so as to call a verification logic contained in the intelligent contract, and the signed authorization information is signed and verified based on the public key of the user;

and responding to the passing of signature verification, further calling signature logic contained in the intelligent contract, and performing signature processing on a position corresponding to the touch point in the target digital file output and displayed to the user through the touch display screen based on the digital seal corresponding to the identity information of the user.

Optionally, the method further includes:

acquiring a target digital file subjected to signature processing;

and outputting and displaying the acquired target digital file subjected to signature processing to the user.

The application also provides a digital signature device which is applied to a first terminal for initiating the digital signature; the device comprises:

the system comprises an acquisition unit, a signature unit and a signature unit, wherein the acquisition unit is used for acquiring digital signature operation which is initiated by a user and aims at a target digital file to be signed;

and the transmission unit is used for responding to the digital signature operation, acquiring the identity information of the user, performing short-distance wireless communication with a second terminal maintaining the target digital file, transmitting the identity information of the user to the second terminal, enabling the second terminal to use the identity information of the user as a calling parameter, calling an intelligent contract which is arranged on a block chain and used for signing and sealing the digital file, and signing and sealing the target digital file based on a digital seal corresponding to the identity information of the user.

The application also provides another digital signature device which is applied to a second terminal maintaining a target digital file to be signed; the device comprises:

a receiving unit, configured to receive identity information of a user, which is transmitted by a first terminal in response to a user-initiated digital signature operation for the target digital file and is in short-range wireless communication with a second terminal;

and the signature unit is used for responding to the identity information of the user transmitted by the first terminal, taking the identity information of the user as a calling parameter, calling an intelligent contract which is arranged on a block chain and used for signing a digital file, and signing the target digital file based on a digital seal corresponding to the identity information of the user.

The application also provides an electronic device, which comprises a communication interface, a processor, a memory and a bus, wherein the communication interface, the processor and the memory are mutually connected through the bus;

the memory stores machine-readable instructions, and the processor executes the method by calling the machine-readable instructions.

The present application also provides a machine-readable storage medium having stored thereon machine-readable instructions which, when invoked and executed by a processor, implement the above-described method.

In the above embodiment, on one hand, a user only needs to initiate a digital signature operation for a target digital file maintained by a second terminal through a first terminal, and the first terminal only needs to respond to the digital signature operation and transmit the identity information of the user to the second terminal through short-distance wireless communication, and the second terminal can invoke an intelligent contract deployed on a block chain based on the acquired identity information of the user, and automatically perform signature processing on the target digital file based on a digital seal corresponding to the identity information of the user, that is, can automatically implement a digital signature process, and does not need the user to perform other operations, so that the user experience of digital signature is improved, and the efficiency of digital signature is improved.

On the other hand, as the block chain is provided with the intelligent contract for signing the digital file, the second terminal can call the intelligent contract to sign the target digital file based on the acquired identity information of the user; therefore, based on the characteristics of decentralized, non-traceable, traceable and the like of the block chain, the credibility, traceable and non-traceable of the digital signature process can be ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present disclosure, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a schematic diagram of an application environment of a blockchain-based digital signature method in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of creating an intelligent contract and invoking the intelligent contract in one embodiment of the present description;

FIG. 3 is a flow chart of a digital signature method in one embodiment of the present disclosure;

FIG. 4 is a flow chart of a digital signature method in another embodiment of the present description;

fig. 5 is a schematic structural diagram of an electronic device in which a digital signature apparatus is located in an embodiment of the present specification;

FIG. 6 is a block diagram of a digital signature device in one embodiment of the present description;

FIG. 7 is a block diagram of a digital signature device in another embodiment of this specification.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present specification, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification without any creative effort shall fall within the protection scope of the present specification.

For individuals, enterprises and various institutions, the entity seal held by the individual, the enterprise and various institutions can be used to perform signature processing on related documents, namely, a seal image corresponding to the entity seal can be added on a paper document, and a signature can also be handwritten to indicate the authenticity and correctness of the document approved by a seal holder or a signer.

The types of common seals can be classified into enterprise official seals, invoice special seals, contract seals, corporate seals, financial seals and the like. In practical application, a user can use a seal of a specific type to sign a file of a corresponding type; for example, business posts may be signed using business official stamps, business contracts may be signed using contract stamps, and so forth.

However, the physical seal has many inconveniences in the using process. For example, a person skilled in the art needs to store and manage a physical seal, and before using the physical seal, a user needs to apply a seal application, receive the physical seal after the application is passed, and after stamping a paper document with the physical seal, the user needs to keep the physical seal properly and return the seal in time.

However, when a user uses one terminal device to manage a digital seal related to the terminal device, a very complicated interaction flow is often required to be executed when a digital file to be signed maintained by another terminal device needs to be signed. Therefore, in the above scenario, how to improve the efficiency of digital signature and improve the user experience of digital signature becomes a problem to be solved urgently.

In view of this, the present specification aims to provide a technical solution for transmitting user identity information between two terminals through short-distance wireless communication and then automatically signing a digital file based on the acquired identity information.

When the method is realized, a first terminal initiating digital signature can acquire digital signature operation which is initiated by a user and aims at a target digital file to be signed; in response to the digital signature operation, the first terminal can acquire the identity information of the user and perform short-distance wireless communication with a second terminal maintaining the target digital file so as to transmit the identity information of the user to the second terminal; further, after receiving the identity information of the user, the second terminal may use the identity information of the user as a calling parameter, call an intelligent contract which is deployed on a blockchain and used for signing and sealing a digital file, and sign and seal the target digital file based on a digital seal corresponding to the identity information of the user.

For example, the first terminal may be a mobile terminal such as a mobile phone, and the second terminal may be a PC (Personal Computer) terminal; the first terminal may be equipped with a client for managing the identity information of the user, or may be equipped with a client for managing the digital seal of the user. In a scene that a user manages a digital seal related to the user by using a mobile phone and signs a digital file to be signed and displayed to the user on a display screen carried by a PC (personal computer) end, if a display screen carried by a first terminal displays a usable digital seal and a selectable digital file to be signed to the user, and the digital signature operation initiated by the user for the digital file can be acquired by responding to the detection of the selection operation of the user for a certain digital seal and a certain digital file, the first terminal can carry out short-distance wireless communication with a second terminal so as to transmit the identity information of the user to the second terminal; further, the second terminal may use the received identity information of the user as a call parameter, call an intelligent contract which is deployed on the blockchain and used for signing and sealing the digital file, and sign and seal the digital file based on the digital seal corresponding to the identity information of the user.

Therefore, in the technical scheme in this specification, on one hand, a user only needs to initiate a digital signature operation on a target digital file maintained by a second terminal through a first terminal, and the first terminal only needs to respond to the digital signature operation and transmit identity information of the user to the second terminal through short-distance wireless communication, so that the second terminal can call an intelligent contract deployed on a block chain based on the acquired identity information of the user, and automatically perform signature processing on the target digital file based on a digital seal corresponding to the identity information of the user, that is, the digital signature process can be automatically realized, and the user experience of digital signature is improved and the efficiency of digital signature is improved.

In order to make those skilled in the art better understand the technical solution in the embodiment of the present disclosure, a brief description will be given below of the related art of the block chain related to the embodiment of the present disclosure.

Current blockchain systems typically include two mainstream transaction models: an UTXO (Unspent Transaction Output) model represented by a bitcoin system; another is an account model represented by the Ethereum (Ethereum) system.

When the data storage is realized for the block chain adopting the account model, the block chain data which needs to be stored and maintained by the node equipment of the block chain usually comprises the block data and account state data corresponding to the block chain accounts in the block chain; the tile data may further include tile header data, tile transaction data in the tile, and transaction receipts corresponding to the tile transaction data in the tile, etc.

When storing the various blockchain data shown above, the node device of the blockchain can organize the various blockchain data into a Merkle tree to be stored in a database in the form of key-value key value pairs. When the various blockchain data stored in the node device need to be queried, the data can be efficiently queried by traversing the Merkle tree by taking the keys of the various blockchain data as query indexes.

In such a blockchain model, an intelligent contract for data verification may be deployed on a blockchain, and a user may store data that needs to be verified as an account state of a contract account corresponding to the intelligent contract into a Merkle tree corresponding to the intelligent contract by calling the intelligent contract.

For example, in EtherFang, a special Merkle tree, called an MPT tree, is typically used to store and maintain blockchain data; for the account state data, an MPT state tree (commonly called world state) can be organized and stored in the database; the MPT state tree stores key-value key value pairs with account addresses as keys and account state data as values. The data content stored in the contract account corresponding to the intelligent contract is further organized into a storage tree (an MPT storage tree for storing data) to be stored in the database; filling the hash value of the root node of the storage tree into the MPT state tree as a part of account state data corresponding to the contract account; the hash of the root node of the MPT state tree is used as the authentication root and is further filled into the block header. When a user needs to perform data storage, the data needing to be stored can be used as account state data of a contract account corresponding to the intelligent contract in a mode of calling the intelligent contract and stored in a storage tree corresponding to the intelligent contract.

In the field of block chaining, an important concept is Account (Account); taking an ether house as an example, the ether house generally divides an account into an external account and a contract account; the external account is an account directly controlled by the user and is also called a user account; and the contract account is created by the user through an external account, the account containing the contract code (i.e. the smart contract). Of course, for some blockchain models derived from the ethernet-based architecture (such as ant blockchains), account types supported by the blockchain may be further expanded, and are not particularly limited in this specification.

For accounts in a blockchain, the account status of the account is usually maintained through a structure. When a transaction in a block is executed, the status of the account associated with the transaction in the block chain is also typically changed.

In one example, the structure of an account typically includes fields such as Balance, Nonce, Code, and Storage. Wherein:

a Balance field for maintaining the current account Balance of the account;

a Nonce field for maintaining a number of transactions for the account; the counter is used for guaranteeing that each transaction can be processed only once, and replay attack is effectively avoided;

a Code field for maintaining a contract Code for the account; in practical applications, only the hash value of the contract Code is typically maintained in the Code field; thus, the Code field is also commonly referred to as the Codhash field.

A Storage field for maintaining the Storage contents of the account (default field value is null); for a contract account, a separate storage space is usually allocated to store the storage content of the contract account; this separate storage space is often referred to as the account storage of the contract account.

The storage content of the contract account is usually constructed into a data structure of an MPT (Merkle Patricia Trie) tree and stored in the independent storage space; in which, the Storage content based on the contract account is constructed into an MPT tree, which is also commonly referred to as a Storage tree. Whereas the Storage field typically maintains only the root node of the Storage tree; thus, the Storage field is also commonly referred to as the StorageRoot field.

Wherein, for the external account, the field values of the Code field and the Storage field shown above are both null values.

Referring to fig. 1, fig. 1 is a schematic application environment diagram of a block chain-based pass authentication method according to an exemplary embodiment.

In a network environment as shown in fig. 1, may include a client-side computing device 101, a server-side 102, and at least one blockchain system; such as blockchain system 103, blockchain system 104, and blockchain system 105.

In one embodiment, the client-side computing device 101, may include a variety of different types of client-side computing devices; for example, the client-side computing devices may include devices such as PC terminal devices, mobile terminal devices, internet of things devices, and other forms of smart devices with certain computing capabilities, among others.

In one embodiment, at least some of the client-side computing devices 101 may be coupled to the server-side 102 through various communication networks; for example, device 1 and device 2 shown in fig. 1 are coupled to server side 102.

It will be appreciated that some of the client-side computing devices 101 may not be coupled to the server-side 102, but may be coupled directly to the blockchain system as blockchain nodes through various communication networks; for example, the apparatus 4 shown in fig. 1 may be coupled to the blockchain system as a blockchain link point.

Wherein, the communication network may comprise a wired and/or wireless communication network; for example, the Network may be a Local Area Network (LAN), a Wide Area Network (WAN), the internet, or a combination thereof, implemented based on a wired access Network or a wireless access Network provided by an operator, such as a mobile cellular Network.

In one embodiment, the client-side computing device 101, may also include one or more user-side servers; such as the device 5 shown in fig. 1. At least some of the client-side computing devices 101 may be coupled to the user-side server, which may be further coupled to the server 102; for example, devices 1 and 2 shown in fig. 1 are coupled to device 5, and device 5 is further coupled to server side 102.

In one embodiment, the server side 102 may also be coupled to one or more blockchain systems through various communication networks; for example, the server side 102 shown in fig. 1 may be coupled to the blockchain system 103, the blockchain system 104, and the blockchain system 105, respectively, and so on.

In one embodiment, each blockchain system may maintain one or more blockchains (e.g., public blockchains, private blockchains, federation blockchains, etc.) and include a plurality of blockchain nodes for carrying the one or more blockchains; for example, a block chain node 1, a block link point 2, a block link point 3, a block link point 4, a block link point i, etc., as shown in fig. 1, may collectively carry one or more block chains. And cross-chain data access can be performed among the blockchains contained in each blockchain system and among the blockchain systems.

In one embodiment, a block link point may be a physical device, or may be a virtual device implemented in a server or a server cluster; for example, the block-node device may be a physical host in a server cluster, or may be a virtual machine created after a virtualization technology is performed on a server or a hardware resource carried by the server cluster. Each blockchain node may be coupled together by various types of communication methods (e.g., TCP/IP) to form a network to carry one or more blockchains.

In one embodiment, the server 102 may include a BaaS platform (also referred to as a BaaS cloud) for providing a Blockchain as a Service (BaaS). The BaaS platform can provide a pre-programmed software mode for activities (such as subscription and notification, user verification, database management and remote update) occurring on the blockchain, provides a simple and easy-to-use, one-key deployment, quick verification and flexibly customized blockchain service for client-side computing equipment coupled with the BaaS platform, and further can accelerate the development, testing and online of blockchain service application and assist the landing of blockchain business application scenes in various industries.

In one embodiment, the BaaS platform may also provide enterprise-level platform services based on blockchain technology to help enterprise-level customers construct a secure and stable blockchain environment and easily manage deployment, operation, maintenance, and development of blockchains.

It should be noted that, each time a latest block is generated in the blockchain, the corresponding status of the executed transactions in the blockchain changes after the transaction in the latest block is executed. For example, in a block chain constructed by an account model, the account status of an external account or a smart contract account usually changes correspondingly with the execution of a transaction.

For example, when a "transfer transaction" is completed in a block, the balances of the transferring party account and the transferring party account associated with the "transfer transaction" (i.e., the field values of the Balance fields of these accounts) are usually changed.

For another example, the "intelligent contract invocation transaction" in the block is used to invoke an intelligent contract deployed on the blockchain, invoke the intelligent contract in the EVM corresponding to the node device to execute the "intelligent contract invocation transaction", and update the account status of the intelligent contract account in the account of the intelligent contract after the execution of the intelligent contract invocation transaction.

In practical applications, whether public, private, or alliance, it is possible to provide the functionality of an intelligent contract (Smart contract). An intelligent contract on a blockchain is a contract on a blockchain that can be executed triggered by a transaction. An intelligent contract may be defined in the form of code.

Taking an Etherhouse as an example, a user is supported to create and call some complex logic in the Etherhouse network. The ethernet workshop is used as a programmable block chain, and the core of the ethernet workshop is an ethernet workshop virtual machine (EVM), and each ethernet workshop node can run the EVM. The EVM is a well-behaved virtual machine through which various complex logic can be implemented. The user issuing and invoking the intelligent contracts in the etherhouse is running on the EVM. In fact, the EVM directly runs virtual machine code (virtual machine bytecode, hereinafter referred to as "bytecode"), so the intelligent contract deployed on the blockchain may be bytecode.

Turning to FIG. 2, FIG. 2 is a diagram illustrating the creation of an intelligent contract and invocation of an intelligent contract in accordance with an exemplary embodiment.

An intelligent contract is created in an Ethernet workshop and needs to be subjected to the processes of compiling the intelligent contract, changing the intelligent contract into byte codes, deploying the intelligent contract to a block chain and the like. Calling the intelligent contract in the Ethernet workshop initiates a transaction pointing to the intelligent contract address, the EVM of each node can respectively execute the transaction, and the intelligent contract code is operated in a virtual machine of each node in the Ethernet workshop in a distributed mode.

After the user sends a transaction containing the calling intelligent contract information to the ethernet network, each node can execute the transaction in the EVM. The From field of the transaction is used for recording the address of the account initiating the calling of the intelligent contract, the To field is used for recording the address of the called intelligent contract, and the Data field of the transaction is used for recording the method and the parameter for calling the intelligent contract. After invoking the smart contract, the account status of the contract account may change. Subsequently, a client may check the account status of the contract account through the accessed block link points, for example, the account status may be stored in the Storage tree of the intelligent contract in the form of a Key-Value pair. The results of the execution of the transaction that invokes the smart contract, which may be in the form of a transaction receipt (receipt), are stored in the MPT receipt tree.

The intelligent contract can be independently executed at each node in the blockchain in a specified mode, and all execution records and data are stored on the blockchain, so that after the transaction is executed, transaction certificates which cannot be tampered and cannot be lost are stored on the blockchain.

The technical solution in this specification is described below by using specific embodiments and combining specific application scenarios.

Referring to fig. 3, fig. 3 is a flowchart of a digital signature method in an embodiment of the present disclosure. The digital signature method can be applied to a first terminal for initiating digital signature so as to realize the technical scheme of the specification.

In this specification, the second terminal may be used to maintain a digital file; and a user can initiate a digital signature process of a target digital file which needs signature processing and is maintained by the second terminal through the first terminal.

The first terminal and the second terminal can carry out short-distance wireless communication to realize data transmission; the second terminal can access the block chain to realize data interaction with the block chain. Specifically, the second terminal may be connected to a node device in the block chain, and may also be connected to a block chain service platform. The blockchain may be any type of blockchain that provides an intelligent contract function, and is not particularly limited in this specification.

For example, in conjunction with fig. 1, the second terminal may be applied to the client-side computing device 101, and specifically, the second terminal may be directly connected to any node device in the blockchain system 103, or may be connected to the blockchain system 103 through a blockchain service platform (such as the server side 102 shown in fig. 1). The first terminal may be connected to the blockchain system 103 so as to manage the digital seals of the users stored in the blockchain; the first terminal may also communicate with the second terminal only without being connected to the blockchain system 103, which is not limited in this specification.

In this specification, the above-mentioned digital signature method may perform the following steps:

step 302: acquiring a digital signature operation initiated by a user and aiming at a target digital file to be signed;

step 304: and responding to the digital signature operation, acquiring the identity information of the user, performing short-distance wireless communication with a second terminal maintaining the target digital file, transmitting the identity information of the user to the second terminal, so that the second terminal takes the identity information of the user as a calling parameter, calling an intelligent contract which is arranged on a block chain and used for signing and sealing the digital file, and signing and sealing the target digital file based on a digital seal corresponding to the identity information of the user.

In this specification, the first terminal may obtain a digital signature operation initiated by the user for the target digital file.

The user initiating the digital signature operation on the target digital file may be understood as a legal owner of the digital seal for performing signature processing on the target digital file, or another user who is authorized by the legal owner to use the digital seal. It should be noted that the user may be an individual user, or may also be an impersonal user such as an organization, an enterprise, and the like, which is not limited in this specification.

The target digital file is a digital file that needs to be signed in any of all digital files maintained by the second terminal. In implementation, the digital file maintained by the second terminal may be locally stored in the second terminal, or may be stored in a service terminal or a block chain accessed by the second terminal, and the second terminal may maintain a file identifier of the digital file, and call a corresponding digital file stored in the service terminal or the block chain.

For example, the first terminal may output a user interface for signing a digital file to the user; the user can select a target digital file needing signature processing in the user interface; subsequently, in response to detecting the selected operation of the user for the target digital file, the first terminal may consider that the digital signature operation initiated by the user for the target digital file is obtained.

For another example, after the user selects the target digital file, the user may further click an "ok" button in the user interface, and in response to detecting that the user clicks the "ok" button, the first terminal may consider that the digital signature operation initiated by the user for the target digital file is acquired.

For another example, after the user selects the target digital file, a target digital stamp that needs to be signed to the target digital file may be selected from all digital stamps with permission to use by the user, and in response to detecting that the user selects the target digital file and the target digital stamp, the first terminal may consider that the digital signing operation initiated by the user and based on the target digital file by the target digital stamp is obtained.

In one embodiment, the digital signature operation may include an operation of the user holding the first terminal close to the second terminal.

When the distance between the first terminal and the second terminal is smaller than a preset threshold, it can be considered that the user holds the first terminal close to the second terminal. It should be noted that, regarding the value of the preset threshold, a person skilled in the art can flexibly set the value as needed, and the description does not limit this; for example, the value of the preset threshold may be not less than 0 and does not exceed a maximum distance supported by short-distance wireless communication between the first terminal and the second terminal.

For example, if the first terminal detects that the user holds an operation that the first terminal is close to the second terminal, it may be obtained that the user initiates a digital signature operation for the target digital file.

In a possible case, the second terminal is provided with a touch display screen; the target digital file to be signed can be output and displayed to the user through a touch display screen carried by the second terminal; the digital signature operation may specifically include an operation in which the user holds the first terminal and contacts a touch display screen mounted on the second terminal. For example, in response to the user holding the first terminal and contacting a touch display screen mounted on the second terminal, it may be determined that the user holding the first terminal is close to the second terminal, and thus the first terminal may acquire a digital signature operation initiated by the user for the target digital file; in addition, in response to an operation that the user holds the first terminal in contact with the touch display screen mounted on the second terminal, the second terminal may further determine a touch point of the first terminal on the touch display screen mounted on the second terminal.

In this specification, in response to the digital signature operation, the first terminal may acquire the identity information of the user and perform short-range wireless communication with a second terminal that maintains the target digital file to transmit the identity information of the user to the second terminal; accordingly, the second terminal may receive the identity information of the user transmitted by the first terminal.

The identity information of the user may specifically include a combination of one or more of the following: the identity of the user (for example, biological characteristic information such as face information and fingerprint information, an account used for logging in a client, and the like); a blockchain account of the user; other information that may be used to uniquely refer to the user.

For example, in response to acquiring a digital signature operation initiated by the user for the target digital file, the first terminal may acquire an identity of the user and perform short-distance wireless communication with the second terminal to transmit the identity of the user to the second terminal; accordingly, the second terminal may receive the identity of the user transmitted by the first terminal.

For another example, in response to acquiring a digital signature operation initiated by the user for the target digital file, the first terminal may acquire the identity of the user and the file identifier of the target digital file, and perform short-distance wireless communication with the second terminal to transmit the identity of the user and the file identifier of the target digital file to the second terminal; correspondingly, the second terminal may receive the user identity and the file identity of the target digital file transmitted by the first terminal, and the user identity and the file identity of the target digital file may be used to indicate that the signature processing is performed on the target digital file based on the digital seal of the user.

In one embodiment, the short-range wireless Communication may specifically include NFC (Near Field Communication). The NFC technology is a short-range, high-frequency wireless communication technology, and two terminal devices supporting the NFC technology can exchange data while being close to each other.

For example, in response to acquiring a digital signature operation initiated by the user and directed to the target digital file, the first terminal may acquire an identity of the user and transmit the identity of the user to the second terminal through an NFC technology; accordingly, the second terminal may receive the identity of the user transmitted by the first terminal through NFC technology.

It should be noted that, in the above illustrated embodiment, compared with the wireless communication technologies such as RFID (Radio Frequency Identification), bluetooth (Blue Tooth), etc., the NFC technology is adopted to transmit the identity information of the user between the first terminal and the second terminal, which is safer and faster, and the cost is lower.

For example, the communication distance of the RFID technology may reach 3m, the communication distance of the bluetooth technology may reach 100m, and the communication distance of the NFC technology is within 20 cm. Therefore, the communication distance supported by the NFC technology is far shorter than that supported by other short-distance wireless communication technologies, so that the digital signature operation for the target digital file can be triggered only when the user holds the first terminal close to the second terminal, and further the identity information of the user can be transmitted to the second terminal, so that the misuse of the identity information of the user can be avoided, and the safety of the digital signature is ensured.

In one embodiment, before performing short-range wireless communication with the second terminal, to ensure that the user has usage rights for the target digital seal and/or signing rights for the target digital file, the method may further include: responding to the digital signature operation, and performing identity verification on the user based on the acquired identity information of the user; and if the user passes the authentication, performing short-distance wireless communication with the second terminal to transmit the identity information of the user to the second terminal.

For example, an associative relationship between the digital stamp and the identity relationship of the user may be maintained; the first terminal can search the identity information of the user corresponding to the target digital seal according to the association relation; if the user can be found, the user can be considered to pass the authentication, otherwise, the user can be considered not to pass the authentication.

For another example, the first terminal may search for a digital stamp corresponding to the acquired identity information of the user according to an association relationship between the digital stamp and the identity relationship of the user; if the user can be found, the user can be considered to pass the authentication, otherwise, the user can be considered not to pass the authentication.

In this specification, after the second terminal receives the identity information of the user transmitted by the first terminal, in response to the identity information of the user transmitted by the first terminal, the second terminal may use the identity information of the user as a calling parameter, call an intelligent contract which is deployed on the blockchain and used for signing a digital file, and sign the target digital file based on a digital seal corresponding to the identity information of the user.

The identity information of the user is used as a calling parameter for the second terminal, and a specific implementation manner of the intelligent contract deployed on the blockchain is called, wherein the specific implementation manner may be a transaction form called for the intelligent contract or a request message form.

For example, after the first terminal and the second terminal perform short-distance wireless communication, and the second terminal receives the identity information of the user transmitted by the first terminal, if the second terminal is directly connected to a node device in the blockchain, the node device may receive a signature request transaction initiated by the second terminal for the target digital file, where the signature request transaction may include the identity information of the user; further, the node device in the blockchain may call an intelligent contract deployed on the blockchain and used for signing a digital file in response to the signing request transaction, and perform signing processing on the target digital file based on a digital seal corresponding to the identity information of the user.

For another example, after the first terminal performs short-distance wireless communication with the second terminal, and the second terminal receives the identity information of the user transmitted by the first terminal, if the second terminal accesses the blockchain through the blockchain service platform, the second terminal may send a signature request message for the target digital file to the blockchain service platform, where the signature request message may include the identity information of the user; further, the blockchain service platform may initiate a signature request transaction for the target digital file to a node device in the blockchain in response to the signature request message; further, the node device in the blockchain may call an intelligent contract deployed on the blockchain and used for signing a digital file in response to the signing request transaction, and perform signing processing on the target digital file based on a digital seal corresponding to the identity information of the user.

In one embodiment, the second terminal is provided with a touch display screen; the target digital file to be signed can be output and displayed to the user through a touch display screen carried by the second terminal; the digital signature operation may specifically include an operation in which the user holds the first terminal and contacts a touch display screen mounted on the second terminal. In this case, since the second terminal may determine a touch point of the first terminal on the touch display screen, the process of calling an intelligent contract deployed on a blockchain for signing a digital file by using the identity information of the user as a calling parameter, and signing the target digital file based on a digital seal corresponding to the identity information of the user may specifically include: and calling an intelligent contract which is deployed on the block chain and used for signing a digital file by taking a touch point of the first terminal on a touch display screen carried by the second terminal and the identity information of the user as calling parameters, and signing the digital file at a position corresponding to the touch point in the target digital file which is output and displayed to the user through the touch display screen based on a digital seal corresponding to the identity information of the user.

For example, the target digital file to be signed may be output and displayed to the user through a touch display screen mounted on the second terminal, and according to a position in the target digital file that needs to be sealed, the user may hold the first terminal to contact the touch display screen to output and display a corresponding position in the target digital file to the user, so as to initiate a digital signature operation for the position in the target digital file corresponding to the touch point; further, in response to an operation that the user holds the first terminal to contact a touch display screen mounted on the second terminal, the second terminal may determine a touch point of the first terminal on the touch display screen and may receive identity information of the user transmitted by the first terminal through short-range wireless communication; further, the second terminal may use the touch point and the identity information of the user as call parameters, call an intelligent contract which is deployed on the blockchain and used for signing and sealing a digital file, and perform signing and sealing processing on a position, corresponding to the touch point, in the target digital file which is output and displayed to the user through the touch display screen based on a digital seal corresponding to the identity information of the user.

It should be noted that, in the above illustrated embodiment, a "touch-and-bump" manner may be adopted between the first terminal and the second terminal, so that the second terminal may obtain information such as identity information and a stamping position of a user (that is, a contact point of the first terminal on the touch display screen), and further implement that a digital stamp corresponding to the identity information of the user is stamped on a designated position in a target digital file maintained by the second terminal, thereby further simplifying user operation in a digital stamping process, improving user experience of digital signature, and improving efficiency of digital signature.

In another embodiment shown, in order to ensure the security of the digital seal, authorization may be performed based on the private key of the user, so as to perform signature processing on the target digital file using the digital seal of the user.

The process of taking a touch point of the first terminal on a touch display screen carried by the second terminal and the identity information of the user as calling parameters, calling an intelligent contract which is deployed on a block chain and used for signing and processing a digital file, and based on a digital seal corresponding to the identity information of the user, signing and processing a position, corresponding to the touch point, in the target digital file which is output and displayed to the user through the touch display screen specifically may include: generating authorization information used for indicating that the target digital file is signed and sealed based on the digital seal of the user; the authorization information is signed based on a private key of the user, the signed authorization information is used as a calling parameter, and the authorization information is further submitted to an intelligent contract which is deployed on the block chain and used for signing a digital file, so that a verification logic contained in the intelligent contract is called, and signature verification is carried out on the signed authorization information based on a public key of the user; and responding to the passing of signature verification, further calling signature logic contained in the intelligent contract, and performing signature processing on a position corresponding to the touch point in the target digital file output and displayed to the user through the touch display screen based on the digital seal corresponding to the identity information of the user.

The authorization information may be generated based on a combination of one or more of the identity information of the user, the file identifier of the target digital file, and a touch point of the first terminal on a touch display screen mounted on the second terminal.

For example, the authorization information may include the identity information of the user, the file identifier of the target digital file, and the touch point, and the information may be used to indicate that the user authorizes signature processing on a location in the target digital file corresponding to the touch point based on the digital seal of the user. For another example, the authorization information may include the identity information of the user and the file identifier of the target digital file, and the information may be used to indicate that the user authorizes the signature processing on any position in the target digital file based on the digital seal of the user.

For another example, the authorization information may not include the generated information, but is only a generated authorization credential file, and the authorization credential file may be used to indicate that the user authorizes the use of the digital stamp of the user.

The verification logic included in the intelligent contract, that is, the verification logic corresponding to part of the contract code included in the intelligent contract; the intelligent contract comprises signature logic, namely signature logic corresponding to part of contract codes contained in the intelligent contract.

The private key of the user and the public key of the user are the private key and the public key in a pair of asymmetric keys held by the user. For a specific implementation manner of the private key of the user performing signature processing on the authorization information and verifying the signature of the signed authorization information based on the public key of the user, please refer to related technologies, which are not described herein.

In practical application, the user can store the private key held by the user to the storage system by trusteeship, so that the user is prevented from keeping the private key by himself, and convenience is provided for the user while data security of the private key is guaranteed.

In one case, the private key of the user may be hosted and stored in a TEE (Trusted Execution Environment) hosted by the second terminal; the process of signing the authorization information based on the private key of the user may specifically include: in the TEE, signature processing is carried out on the authorization information based on the private key of the user stored in the TEE.

In another case, the private key of the user may be hosted and stored in a TEE hosted by secure hardware accessing the second terminal; the process of signing the authorization information based on the private key of the user may specifically include: and sending the authorization information to the security hardware so as to carry out signature processing on the authorization information in a TEE carried by the security hardware based on the private key of the user stored in the TEE.

In yet another case, the user's private key may be hosted for storage in a TEE hosted by a third party storage platform; the process of signing the authorization information based on the private key of the user may specifically include: and sending the authorization information to the third-party storage platform so that the third-party storage platform signs the authorization information in the TEE based on the private key of the user stored in the TEE. The third-party storage platform can be a cloud storage platform.

In the above illustrated embodiment, the signing the target digital file based on the digital seal corresponding to the identity information of the user may specifically include: and acquiring a signature image corresponding to the digital seal of the user, and adding the signature image to the target digital file.

In a possible implementation, the block chain maintains the association relationship between the user identity information and the digital seal, and the digital seal corresponding to the user identity information maintained on the block chain can be directly called. In implementation, the process of obtaining the signature image corresponding to the digital seal of the user may specifically include: and acquiring a signature image of the digital seal of the user according to the identity information of the user.

In another possible embodiment, a digital stamp of the user may be temporarily generated based on the acquired identity information of the user. In implementation, the process of obtaining the signature image corresponding to the digital seal of the user may specifically include: and generating a signature image of the digital seal for the user based on the identity information of the user.

In each of the above-described implementations, a signature image corresponding to the digital seal of the user may be directly added to a corresponding seal position in the target digital file; or, a signature image corresponding to the digital seal of the user may be added to the target digital file in the form of a digital watermark.

Optionally, the resolution of the digital watermark may be greater than the copy resolution. Wherein, the copying resolution is the maximum resolution supported by the copying device; in general, since the copy resolution is designed with reference to the maximum resolution of the human eye, the copy resolution does not usually exceed 300 dpi. Specific values of the resolution of the digital watermark can be flexibly set by those skilled in the art as required, and are not particularly limited in this specification; for example, if the printing resolution of the printing apparatus is 1200dpi, the resolution of the digital watermark may be larger than the copy resolution and smaller than the printing resolution, that is, the resolution of the digital watermark may take any value in the interval of (300dpi, 1200 dpi).

It should be noted that, in the case that the resolution of the digital watermark is greater than the copy resolution, the printed matter and the copy corresponding to the target digital file can be distinguished; based on this, when the target digital file added with the digital watermark is printed and then further copied, the digital watermark is lost, so that the digital watermark cannot be detected from the copy, and then the printed matter and the copy can be distinguished.

In an embodiment shown, in order to implement traceability of a digital signature process, a digital file that is signed based on a digital seal of a user by calling the intelligent contract may be recorded, so that validity verification may be performed subsequently on a target digital file that is signed.

When the intelligent contract is realized, the node equipment in the block chain is called in response to the intelligent contract, and the signature record of the user for the target digital file can be generated and stored in the block chain. Subsequently, if the validity of the target digital file which is provided by the user and is sealed is required to be checked, whether a signature record corresponding to the target digital file is certified in the block chain can be determined; if the certificate is not stored, the target digital file provided by the user and subjected to the stamping processing can be determined to be an illegal file subjected to stamping and counterfeiting.

In this specification, in order to visually present a result of the signature processing performed on the target digital file to the user, after the signature processing is performed on the target digital file based on a digital stamp corresponding to the identity information of the user, the method may further include: the second terminal acquires a target digital file subjected to signature processing; and outputting and displaying the acquired target digital file subjected to signature processing to the user.

For example, after calling the intelligent contract and signing the target digital file based on the digital seal corresponding to the identity information of the user, the node device in the block chain stores the signed target digital file in the block chain, so that the second terminal can acquire the signed target digital file and output and display the acquired signed target digital file to the user.

In an illustrated embodiment, after invoking the intelligent contract and performing signature processing on the target digital file based on a digital seal corresponding to the identity information of the user, the node device in the block chain may further generate an intelligent contract event corresponding to the signature processing performed on the target digital file, where the intelligent contract event includes the target digital file whose signature processing is completed; further, the generated intelligent contract events can be stored in the blockchain, so that the second terminal can perform event monitoring on the intelligent contract events stored in the blockchain; and responding to the monitored intelligent contract event, the second terminal can acquire the target digital file with the completed signature processing and can output and display the acquired target digital file with the completed signature processing to the user.

In another embodiment shown, a node device in the blockchain or the blockchain server platform may perform event listening on an intelligent contract event stored to the blockchain; in response to monitoring the intelligent contract event, the node device or the blockchain server platform may push the intelligent contract event to the second terminal based on an event notification program loaded thereon; further, the second terminal may receive the event notification program to push the smart contract event. And outputting and displaying the acquired target digital file after the signature processing to the user.

The event notification program may specifically include an SDK (Software Development Kit); the SDK may be configured to provide a subscription service for the smart contract event, that is, the SDK may monitor a new smart contract event generated after the smart contract deployed on the blockchain is invoked, and may push the monitored smart contract event to a corresponding user client.

It should be noted that, in the above illustrated embodiment, compared to an implementation manner in which the second terminal actively monitors a new intelligent contract event in the distributed ledger of the blockchain, event monitoring is performed by an event notification program loaded on the blockchain service platform or a node device in the blockchain, and the second terminal only needs to receive the intelligent contract event pushed by the event notification program, so that the event monitoring cost of the printing device can be saved.

According to the embodiments, on one hand, a user only needs to initiate a digital signature operation on a target digital file maintained by a second terminal through a first terminal, and the first terminal only needs to respond to the digital signature operation and transmit the identity information of the user to the second terminal through short-distance wireless communication, so that the second terminal can call an intelligent contract deployed on a block chain based on the acquired identity information of the user, and automatically perform signature processing on the target digital file based on a digital seal corresponding to the identity information of the user, and the digital signature process can be automatically realized, that is, other operations are not required to be performed by the user, so that the user experience of digital signature is improved, and the efficiency of digital signature is improved.

Referring to fig. 4, fig. 4 is a flowchart of a digital signature method in another embodiment of the present disclosure. The above digital signature method may be applied to the second terminal to implement the technical solution of this specification. The digital signature method can execute the following steps:

step 402: receiving identity information of a user, which is transmitted by a first terminal in response to a digital signature operation initiated by the user and aiming at a target digital file, and performing short-distance wireless communication with a second terminal;

step 404: and responding to the identity information of the user transmitted by the first terminal, taking the identity information of the user as a calling parameter, calling an intelligent contract which is deployed on a block chain and used for signing and sealing a digital file, and signing and sealing the target digital file based on a digital seal corresponding to the identity information of the user.

In this specification, the specific implementation manner of steps 402 to 404 is similar to that of steps 302 to 304, and is not described herein again.

Corresponding to the embodiment of the digital signature method, the specification also provides an embodiment of a digital signature device.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an electronic device in which a digital signature apparatus is located in an embodiment of the present disclosure. At the hardware level, the device includes a processor 502, an internal bus 504, a network interface 506, a memory 508, and a non-volatile memory 510, although other hardware required for the service may also be included. One or more embodiments of the present description may be implemented in software, such as by processor 502 reading corresponding computer programs from non-volatile storage 510 into memory 508 and then running. Of course, besides software implementation, the one or more embodiments in this specification do not exclude other implementations, such as logic devices or combinations of software and hardware, and so on, that is, the execution subject of the following processing flow is not limited to each logic unit, and may also be hardware or logic devices.

Referring to fig. 6, fig. 6 is a block diagram of a digital signature device in an embodiment of the present disclosure. The digital signature device can be applied to the electronic device shown in fig. 5 to implement the technical solution of the present specification. Wherein, the digital signature device can include:

an obtaining unit 602, configured to obtain a digital signature operation initiated by a user for a target digital file to be signed;

a transmission unit 604, configured to obtain the identity information of the user in response to the digital signature operation, perform short-distance wireless communication with a second terminal that maintains the target digital file, so as to transmit the identity information of the user to the second terminal, so that the second terminal uses the identity information of the user as a call parameter, calls an intelligent contract that is deployed on a block chain and used for signing a digital file, and signs the target digital file based on a digital seal corresponding to the identity information of the user.

In this embodiment, the digital signature operation includes an operation that the user holds the first terminal close to the second terminal.

In this embodiment, the second terminal is equipped with a touch display screen; the target digital file is output and displayed to the user through the touch display screen; the digital signature operation comprises the operation that the user holds the first terminal and contacts a touch display screen carried by the second terminal;

the transmission unit 604 is specifically configured to:

determining a touch point of the first terminal on a touch display screen carried by the second terminal, performing short-distance wireless communication with the second terminal maintaining the target digital file, transmitting the identity information of the user and the touch point to the second terminal, so that the second terminal takes the touch point of the first terminal on the touch display screen carried by the second terminal and the identity information of the user as calling parameters, calling an intelligent contract which is deployed on a block chain and used for signature processing of the digital file, and performing signature processing on a position corresponding to the touch point in the target digital file which is output and displayed to the user through the touch display screen based on a digital seal corresponding to the identity information of the user.

In this embodiment, the short-range wireless communication includes near field communication NFC.

Referring to fig. 7, fig. 7 is a block diagram of a digital signature apparatus in another embodiment of the present disclosure. The digital signature device can be applied to the electronic device shown in fig. 5 to implement the technical solution of the present specification. Wherein, the digital signature device can include:

a receiving unit 702, configured to receive identity information of a user, which is transmitted by a first terminal in response to a user-initiated digital signature operation for the target digital file and is in short-range wireless communication with a second terminal;

and the signing unit 704 is configured to respond to the identity information of the user transmitted by the first terminal, use the identity information of the user as a calling parameter, call an intelligent contract which is deployed on a blockchain and used for signing a digital file, and sign the target digital file based on a digital seal corresponding to the identity information of the user.

In this embodiment, the digital signature operation includes an operation of the user holding the first terminal close to the second terminal.

the signature unit 704 is specifically configured to:

In this embodiment, the signature unit 704 is specifically configured to:

the authorization information is signed based on a private key of the user, the signed authorization information is used as a calling parameter, and the authorization information is further submitted to an intelligent contract which is deployed on the block chain and used for signing a digital file, so that a verification logic contained in the intelligent contract is called, and signature verification is carried out on the signed authorization information based on a public key of the user;

In this embodiment, the apparatus further includes a display unit, configured to:

acquiring a target digital file subjected to signature processing;

The specific details of the implementation process of the functions and actions of each unit in the above device are the implementation processes of the corresponding steps in the above method, and are not described herein again.

For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are only illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution in the specification. One of ordinary skill in the art can understand and implement it without inventive effort.

In the 90's of the 20 th century, improvements to a technology could clearly distinguish between improvements in hardware (e.g., improvements to circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements to process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain a corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Furthermore, nowadays, instead of manually making an Integrated Circuit chip, such Programming is often implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, but the original code before compiling is also written by a specific Programming Language, which is called Hardware Description Language (HDL), and HDL is not only one but many, such as abel (advanced Boolean Expression Language), ahdl (alternate Hardware Description Language), traffic, pl (core universal Programming Language), HDCal (jhdware Description Language), lang, Lola, HDL, laspam, hardward Description Language (vhr Description Language), vhal (Hardware Description Language), and vhigh-Language, which are currently used in most common. It will also be apparent to those skilled in the art that hardware circuitry for implementing the logical method flows can be readily obtained by a mere need to program the method flows with some of the hardware description languages described above and into an integrated circuit.

The controller may be implemented in any suitable manner, for example, the controller may take the form of, for example, a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, and an embedded microcontroller, examples of which include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic for the memory. Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may thus be considered a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.

The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a server system. Of course, this application does not exclude that with future developments in computer technology, the computer implementing the functionality of the above described embodiments may be, for example, a personal computer, a laptop computer, a vehicle-mounted human-computer interaction device, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device or a combination of any of these devices.

Although one or more embodiments of the present description provide method operational steps as described in the embodiments or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive approaches. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of sequences, and does not represent a unique order of performance. When an actual apparatus or end product executes, it may execute sequentially or in parallel (e.g., parallel processors or multi-threaded environments, or even distributed data processing environments) according to the method shown in the embodiment or the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded. For example, if the terms first, second, etc. are used to denote names, they do not denote any particular order.

For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, when implementing one or more of the present description, the functions of each module may be implemented in one or more software and/or hardware, or a module implementing the same function may be implemented by a combination of multiple sub-modules or sub-units, etc. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage, graphene storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

As will be appreciated by one skilled in the art, one or more embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, one or more embodiments of the present description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, one or more embodiments of the present description may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

One or more embodiments of the present description may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. One or more embodiments of the present specification can also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment. In the description of the specification, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the specification. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is merely exemplary of one or more embodiments of the present disclosure and is not intended to limit the scope of one or more embodiments of the present disclosure. Various modifications and alterations to one or more embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present specification should be included in the scope of the claims.

Claims

1. A digital signature method is applied to a first terminal for initiating digital signature; the method comprises the following steps:

2. The method of claim 1, the digital signature operation comprising an operation of the user holding the first terminal proximate to the second terminal.

3. The method of claim 2, the second terminal having a touch screen display mounted thereon; the target digital file is output and displayed to the user through the touch display screen;

the performing short-distance wireless communication with a second terminal maintaining the target digital file to transmit the identity information of the user to the second terminal, so that the second terminal takes the identity information of the user as a calling parameter, calls an intelligent contract which is deployed on a block chain and used for signing and sealing the digital file, and signs and seals the target digital file based on a digital seal corresponding to the identity information of the user, and comprises the following steps:

4. The method of claim 1, the short-range wireless communication comprising Near Field Communication (NFC).

5. A digital signature method is applied to a second terminal maintaining a target digital file to be signed; the method comprises the following steps:

6. The method of claim 5, the digital signature operation comprising an operation of the user holding the first terminal proximate to the second terminal.

7. The method of claim 6, the second terminal is equipped with a touch display screen; the target digital file is output and displayed to the user through the touch display screen;

8. The method according to claim 7, wherein the step of using a touch point of the first terminal on a touch display screen mounted by the second terminal and the identity information of the user as a calling parameter, calling an intelligent contract deployed on a blockchain and used for signing a digital file, and based on a digital seal corresponding to the identity information of the user, performing signing processing on a position corresponding to the touch point in the target digital file output and displayed to the user through the touch display screen comprises the steps of:

9. The method of claim 5, further comprising:

acquiring a target digital file subjected to signature processing;

10. The method of claim 5, the short-range wireless communication comprising Near Field Communication (NFC).

11. A digital signature device is applied to a first terminal which initiates a digital signature; the device comprises:

12. A digital signature device is applied to a second terminal maintaining a target digital file to be signed; the device comprises:

13. An electronic device comprises a communication interface, a processor, a memory and a bus, wherein the communication interface, the processor and the memory are connected with each other through the bus;

the memory has stored therein machine-readable instructions, the processor performing the method of any of claims 1-4 or 5-10 by invoking the machine-readable instructions.

14. A machine-readable storage medium having stored thereon machine-readable instructions which, when invoked and executed by a processor, implement the method of any of claims 1-4 or 5-10.