CN111586008A - A block chain message management method, node device and block chain node system - Google Patents

Abstract

The present invention provides a block chain message management method, comprising: for the node identifier of each target node, embedding the node identifier of the target node in a message to be published in a watermark manner to obtain a message to be published with a watermark; The public part and the difference part of the message to be published in the watermark are respectively recorded as the public message and the difference message; the public message is encrypted by using the preset encryption key to obtain the encrypted public message; for each of the difference messages, the difference message is used for each difference message. The public key of the corresponding target node encrypts the differential synthesis message including the differential message and the preset encryption key to obtain an encrypted differential message; and publishes the encrypted public message and all the encrypted differential messages to the blockchain. The present invention also provides a node device and a blockchain node system.

Description

A block chain message management method, node device and block chain node system

technical field

The invention relates to the field of communication technologies, in particular to a block chain message management method, node device and block chain node system.

Background technique

When nodes in the blockchain publish confidential information to target group nodes in the blockchain, they usually only want the information to be shared within the target group, and do not want non-group personnel to see the information. In the prior art, the information publishing node can use the public key shared by each user in the target group in the blockchain to encrypt the confidential information to be published, and then publish the encrypted information and the user ID corresponding to each public key in the block chain. On the blockchain, the corresponding users in the blockchain can use their private keys to decrypt their corresponding encrypted information to obtain confidential information, while users in non-target groups in the blockchain can use their private keys to decrypt their own encrypted information to obtain confidential information. Corresponding to the public key of the encrypted information, the encrypted information cannot be decrypted, so that the confidential information cannot be obtained. This method can ensure the security of the confidential information in the blockchain. However, a user with decryption authority can unilaterally send the decrypted information to others by copying, which will lead to the leakage of confidential information. In the prior art, it is difficult to trace the leaker, resulting in a very low cost of leaking, which exacerbates the The risk of leakage; in addition, when the number of users in the target group is large, multiple encrypted information will be stored in the blockchain, resulting in excessive occupation of the effective space of the blockchain.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a block chain message management method, node device and block chain node system to solve the block chain message existing in the prior art The problem of high leakage risk and excessive occupation of blockchain space.

In a first aspect, the present invention provides a blockchain message management method, including:

For the node identification of each target node, the node identification of the target node is embedded in the message to be published in the form of a watermark, so as to obtain a message to be published with a watermark;

Extract the common part and difference part of each watermarked message to be published, and record it as public message and difference message respectively;

Encrypt the public message with a preset encryption key to obtain an encrypted public message;

For each difference message, encrypt the difference synthesis message including the difference message and the preset encryption key by using the public key of the target node corresponding to the difference message to obtain an encrypted difference message;

The encrypted public message and all of the encrypted difference messages are published to the blockchain.

Preferably, before the step of publishing the encrypted public message and each of the encrypted difference messages to the blockchain, the method further includes:

Use its own private key to add a signature to the encrypted public message and each encrypted difference information.

Preferably, before the step of embedding the node identifier of the target node into the message to be published in the form of a watermark for the node identifier of each target node, the method further includes:

Get the node ID of each target node.

Preferably, the watermarking method includes any one of a hidden watermarking method and an explicit watermarking method.

Preferably, the watermarking algorithm in the watermarking manner includes: a spatial domain algorithm, a transform domain algorithm, a wavelet domain algorithm and a superwavelet domain algorithm.

In a second aspect, the present invention also provides a block chain message management method, including:

Receive encrypted public messages and all encrypted differential messages via the blockchain;

Decrypt one of the encrypted difference messages according to its own private key to obtain its own corresponding difference message and a preset encryption key;

Decrypt the encrypted public message using the preset encryption key to obtain the decrypted public message;

The to-be-published message of the message publishing node is obtained according to the common message and the obtained difference message.

Preferably, before the step of decrypting one of the encrypted difference messages according to the own private key to obtain the difference message corresponding to the self and the preset encryption key, the method further includes:

The public key of the message publishing node is obtained, and the public key is used to perform signature verification on the encrypted public message and all encrypted differential messages.

In a third aspect, the present invention also provides a node device, including:

one or more processors;

A first storage device on which one or more programs are stored, when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to implement the first aspect of the invention. Provided blockchain message management method.

In a fourth aspect, the present invention also provides a node device, including:

one or more processors;

A second storage device having one or more programs stored thereon that, when executed by the one or more processors, cause the one or more processors to implement the first aspect of the present invention. Provided blockchain message management method.

In a fifth aspect, the present invention further provides a blockchain node system, which includes: the node devices provided in the third and fourth aspects of the present invention.

Beneficial technical effects of the present invention:

In the blockchain message management method, node device and blockchain node system provided by the present invention, the message publishing node embeds the node identification of the target node in the message to be published in the form of a watermark, and extracts the public part and For the difference part, use the preset encryption key to encrypt the public message, use the public key of the target node to encrypt the difference part and the preset encryption key, and send the encrypted public part and the encrypted difference part to the blockchain , the target node obtains a complete message to be published by combining the common part and the difference part, and the complete message to be published carries the node identification watermark of the target node. Compared with the prior art, in the present invention, since the message to be published obtained by the target node carries the watermark of its own node identification, when the target node leaks the secret, the target node can be tracked conveniently, thereby greatly reducing the leakage of the target node. At the same time, because the public part and the difference part of each message to be published are stored in the blockchain, the occupation of the effective space of the blockchain is reduced.

Description of drawings

FIG. 1 is a flowchart of a blockchain message management method provided in Embodiment 1 of the present invention;

FIG. 2 is a flowchart of a blockchain message management method provided in Embodiment 2 of the present invention;

3 is a flowchart of a method for managing a blockchain message according to Embodiment 3 of the present invention;

FIG. 4 is a flowchart of a blockchain message management method provided in Embodiment 4 of the present invention;

FIG. 5 is a flowchart of a method for managing blockchain messages according to Embodiment 5 of the present invention.

Detailed ways

In order for those skilled in the art to better understand the technical solutions of the present invention, the block chain message management method, node device and block chain node system provided by the present invention are described in detail below with reference to the accompanying drawings.

The block chain message management method provided by the present invention involves a block chain message encryption part and a block chain message decryption part, and the block chain message encryption part and the block chain message decryption part will be described below respectively.

Example 1

Fig. 1 is a flowchart of a method for managing blockchain messages according to Embodiment 1 of the present invention. As shown in Fig. 1 , the method includes:

Step S101: For the node identifier of each target node, embed the node identifier of the target node into the message to be published in a watermark manner to obtain a message to be published with a watermark.

In the present invention, the target node is a node in the blockchain group that will receive the message to be published, and each target node corresponds to a message to be published with a watermark.

Step S102, extracting the common part and the difference part of each watermarked message to be published, and denoting it as the common message and the difference message respectively.

Step S103: Encrypt the public message by using a preset encryption key to obtain an encrypted public message.

Step S104: For each difference message, encrypt the difference synthesis message including the difference message and the preset encryption key by using the public key of the target node corresponding to the difference message to obtain an encrypted difference message.

Step S105: Publish the encrypted public message and all encrypted difference messages to the blockchain.

In the blockchain message management method provided by the present invention, the node identification of the target node is embedded in the message to be published in the form of a watermark, the public part and the difference part of each watermarked message to be published are extracted, and the public message is encrypted by using a preset encryption key. Encrypt, use the public key of the target node to encrypt the difference part and the preset encryption key, and send the encrypted public part and the encrypted difference part to the blockchain. A complete message to be published is obtained, and the complete message to be published carries the node identification watermark of the target node. Compared with the prior art, in the present invention, since the message to be published obtained by the target node carries the watermark of its own node identification, when the target node leaks the secret, the target node can be tracked conveniently, thereby greatly reducing the leakage of the target node. At the same time, because the public part and the difference part of each message to be published are stored in the blockchain, the occupation of the effective space of the blockchain is reduced.

Embodiment 2

The figure is a flowchart of a blockchain message management method provided in Embodiment 2 of the present invention. As shown in Figure 2, the method includes:

Step S201 , acquiring node identifiers of each target node.

The target node is the node in the blockchain group that will receive the message to be published. When the message publishing node needs to publish the message in a targeted manner, it first obtains the node identifier of the target node. Specifically, the message publishing node can obtain the node identifier of each target node by querying the blockchain storage area.

Step S202: For the node identifier of each target node, embed the node identifier of the target node into the message to be published in a watermark manner to obtain a message to be published with a watermark.

After the identification of the target node is obtained, the node identification of each target node is embedded in each message to be published in the form of a watermark to obtain a message to be published with a watermark, wherein the number of messages to be published with a watermark and the number of target nodes same.

In the present invention, the watermarking method may include any one of a hidden watermarking method and an explicit watermarking method. Specifically, the watermarking method can be implemented by using a variety of watermarking algorithms, for example, a spatial domain algorithm, a transform domain algorithm, a wavelet domain algorithm, and a superwavelet domain algorithm. The present invention does not specifically limit the watermarking algorithm.

Step S203, extracting the common part and the difference part of each watermarked message to be published, and denoting it as the common message and the difference message respectively.

Each message to be published has the same part and different part due to the embedding of different node identifiers. By comparing the watermarked messages to be published, the common part and the difference part are extracted. The common part is recorded as the public message, and the difference is Parts are recorded as difference messages.

Step S204: Encrypt the public message by using a preset encryption key to obtain an encrypted public message.

In the present invention, when the public message accounts for a large proportion of the message to be published, the public message is prone to leak the message to be published. At this time, the public message is encrypted by using a preset encryption key, thereby ensuring the information security of the message to be published. .

Of course, in some embodiments, when the public message cannot represent the message to be published, the public message does not need to be encrypted at this time, and step S204 can be omitted.

Step S205: For each difference message, encrypt the difference synthesis message including the difference message and the preset encryption key by using the public key of the target node corresponding to the difference message to obtain an encrypted difference message.

In the present invention, when using the preset encryption key to encrypt the public message, when encrypting the difference message, the difference message and the preset encryption key need to be encrypted at the same time, that is, the difference message and the preset encryption key are encrypted first. The keys are combined to form a differential synthesis message, and then the differential synthesis message is encrypted by using the public key of the target node corresponding to each differential message. Among them, since the difference message is extracted from the message to be published with a watermark, the difference message corresponds to the target node, and the public key of the target node can be obtained by querying the blockchain storage area.

It should be noted that, in this embodiment, step S204 and step S205 may be executed synchronously or sequentially, and the sequence of execution of the two is not limited, as long as the common message and the difference message can be encrypted. FIG. 2 only shows one of the embodiments, which does not limit the present invention.

Step S206, adding a signature to the encrypted public message and each encrypted difference information by using its own private key.

Before publishing the public message and encrypted difference information, use its own private key to add a signature to the public message and each encrypted difference information to verify the identity of the message publishing node.

Step S207, publishing the completed encrypted public message and all encrypted difference messages to the blockchain.

Embodiment 3

FIG. 3 is a flowchart of a method for managing a blockchain message provided in Embodiment 3 of the present invention. The method uses the target node involved in the above embodiment as an execution body. As shown in FIG. 3 , the method includes:

Step S301: Receive the encrypted public message and all encrypted difference messages through the blockchain.

The target node receives the broadcast message containing the encrypted public message and each encrypted difference message published by the message publishing node based on the blockchain.

Step S302: Decrypt one of the encrypted difference messages according to the own private key to obtain the difference message corresponding to the self and the preset encryption key.

In the present invention, after receiving the broadcast message of the message publishing node, the target node uses its own private key to decrypt each encrypted difference message in turn, and when its own private key can successfully decrypt a certain encrypted difference message, it means the encrypted difference message The message is the difference message corresponding to itself, and the corresponding difference message and the preset encryption key are obtained by decrypting the private key.

In this embodiment, since the target node only needs to decrypt the encrypted difference message, compared with the prior art, the decryption of the entire message to be published is avoided, thereby improving the decryption efficiency.

Step S303: Decrypt the public message by using the preset encryption key to obtain the decrypted public message.

The target node decrypts the encrypted public message by using the preset encryption key obtained by decrypting the encrypted difference message, and obtains the decrypted public message.

Step S304: Obtain the message to be published of the message publishing node according to the common message and the obtained difference message.

The target node combines the public message and the obtained difference message to obtain the message to be published of the message publishing node, and the message to be published is embedded with the node identification watermark of the target node itself.

In the blockchain message management method provided by this embodiment, after the target node receives the broadcast message of the message publishing node, it decrypts the encrypted difference message with its own private key to obtain its corresponding difference message and the preset encryption key, and then uses the Set the encryption key to decrypt the encrypted public message, and finally combine the public message and its corresponding difference message to obtain a complete message to be published, and the complete message to be published carries the node identification watermark of the target node. Compared with the prior art, in the present invention, since the message to be published obtained by the target node carries the watermark of its own node identification, when the target node leaks the secret, the target node can be tracked conveniently, thereby greatly reducing the leakage of the target node. At the same time, because the public part and the difference part of each message to be published are stored in the blockchain, the occupation of the effective space of the blockchain is reduced.

Embodiment 4

FIG. 4 is a flowchart of a method for managing blockchain messages according to Embodiment 4 of the present invention. As shown in FIG. 4 , the method includes:

Step S401: Receive the encrypted public message and all encrypted difference messages through the blockchain.

Step S402, using the public key of the message publishing node to perform signature verification on the encrypted public message and all encrypted differential messages.

Step S403 , when the signature verification is passed, decrypt one of the encrypted difference messages according to the private key of the self, so as to obtain the difference message corresponding to the self and the preset encryption key.

Step S404: Decrypt the encrypted public message by using a preset encryption key to obtain a decrypted public message.

Step S405: Obtain the message to be published of the message publishing node according to the common message and the obtained difference message.

In this embodiment, the encrypted public message and encrypted difference message also carry the signature of the message sending node. Before decryption in this embodiment, signature verification of the encrypted public message and encrypted difference message is also required to ensure that the message publishing node identity legality.

The descriptions of other steps in this embodiment are the same as those in Embodiment 3. For details, please refer to the descriptions of Embodiment 3, which will not be repeated here.

Embodiment 5

FIG. 5 is a flowchart of a method for managing a blockchain message according to Embodiment 5 of the present invention. As shown in FIG. 5 , the method includes:

Step S501, the message publishing node obtains the node identifier of each target node.

For example, the node identifiers of each target node are respectively a1, a2...an.

Step S502: For the node identifier of each target node, the message publishing node embeds the node identifier of the target node into the message to be published in the form of a watermark to obtain a message to be published with a watermark.

Embed the target node identification a1 into the message M to be published in the form of a watermark to obtain the message to be published with a watermark M _a1 , and embed the target node identification a2 into the message M to be published in a watermark manner to obtain the message to be published with a watermark M _a2 , so that By analogy, until the target node identifier an is embedded in the message M to be published in the form of a watermark, the message M _an to be published with a watermark is obtained.

Step S503, the message publishing node extracts the common part and the difference part of each watermarked message to be published, which are respectively recorded as the common message and the difference message.

The message publishing node _extracts the public parts of each _watermarked message to be published M _a1 , _{M a2 ......} M _diffn , M _a1 =f(M _pub , M _diff1 ), M _an= f(M _pub , M _diffn ), where f is a combination function.

Step S504, the message publishing node encrypts the public message by using a preset encryption key to obtain an encrypted public message.

The message publishing node uses the preset encryption key K to encrypt the public message M _pub to obtain the encrypted public message C _pub , where C _pub =C _k (M _pub ), and C _k is an encryption function.

Step S505: For each difference message, the message publishing node encrypts the difference synthesis message including the difference message and the preset encryption key by using the public key of the target node corresponding to the difference message to obtain an encrypted difference message.

The message publishing node uses the public key (PK _a1 , PK _a2 ...... PK _an ) of the target node to encrypt the corresponding difference message and the preset encryption key to obtain the encrypted difference message, that is, C _diff1 =CPKa1(M _diff1 , K), C _diff2 =CPKa2(M _diff2 , K)... C _diffn =CPKan(M _diffn , K), wherein CPKa1... CPKan is an encryption algorithm.

Step S506, the message publishing node adds a signature to the encrypted public message and each encrypted difference information by using its own private key.

Step S507, the message publishing node publishes the encrypted public message and all encrypted difference messages to the blockchain.

Step S508, the target node receives the encrypted public message and all encrypted difference messages through the blockchain.

Step S509, using the public key of the message publishing node to perform signature verification on the encrypted public message and all encrypted differential messages.

Step S510: After the signature verification is passed, the target node decrypts one of the encrypted difference messages according to its own private key to obtain its own corresponding difference message and a preset encryption key.

The target node uses its own private key to decrypt the encrypted difference message to obtain its corresponding difference message. For example, the a1 node uses its own private key SKa1 to decrypt C _diff1 to obtain its corresponding difference message M _diff1 and preset encryption key K. , and other nodes also decrypt accordingly.

Step S511, the target node decrypts the encrypted public message by using a preset encryption key to obtain the decrypted public message.

Each target node uses the preset encryption key K obtained by decrypting the encrypted difference message to decrypt the public message C _pub to obtain the decrypted public message M _pub .

Step S512, the target node obtains the message to be published of the message publishing node according to the common message and the obtained difference message.

The target node combines M _pub and the difference message corresponding to itself to obtain the message M to be published. For example, the target node 1 obtains the message M to be published by using the difference message M _diff1 corresponding to M _pub and itself, and the target node 2 corresponds to M _pub and itself. The diff message M _diff2 gets the message M to be published, etc.

Embodiment 6

An embodiment of the present invention further provides a node device, which includes: one or more processors and a first storage device, where one or more programs are stored on the first storage device, when the one or more programs are stored The one or more processors execute, so that the one or more processors implement the blockchain message management methods provided in Embodiment 1 and Embodiment 2 of the present invention.

Embodiment 7

An embodiment of the present invention further provides a node device, which includes: one or more processors and a second storage device, where one or more programs are stored on the second storage device, when the one or more programs are stored The one or more processors execute, so that the one or more processors implement the blockchain message management methods described in Embodiment 3 and Embodiment 4.

Embodiment 8

An embodiment of the present invention further provides a blockchain node system, where the blockchain node system includes the node devices described in Embodiment 6 and Embodiment 7.

It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, without departing from the spirit and essence of the present invention, various modifications and improvements can be made, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (10)

1. A method for block chain message management, comprising:

for the node identification of each target node, embedding the node identification of the target node into the message to be issued in a watermark mode to obtain the message to be issued with the watermark;

extracting a public part and a difference part of each message to be issued with the watermark, and respectively recording the public part and the difference part as a public message and a difference message;

encrypting the public message by using a preset encryption key to obtain an encrypted public message;

for each difference message, encrypting a difference comprehensive message comprising the difference message and the preset encryption key by using a public key of a target node corresponding to the difference message to obtain an encrypted difference message;

issuing the encrypted common message and all of the encrypted difference messages to a blockchain.

2. The method of claim 1, further comprising, prior to said step of publishing said encrypted common message and each said encrypted differential message into a blockchain:

and adding signatures to the encrypted public message and each piece of encrypted difference information by using a self private key.

3. The method according to claim 1, wherein before the step of embedding the node identifier of each target node into the message to be published in a watermark manner, the method further comprises:

and acquiring the node identification of each target node.

4. The method according to any one of claims 1 to 3, wherein the watermarking scheme includes any one of a hidden watermarking scheme and an explicit watermarking scheme.

5. A method according to any of claims 1-3, wherein the watermarking algorithm of the watermarking scheme comprises: a spatial domain algorithm, a transform domain algorithm, a wavelet domain algorithm, and a super-wavelet domain algorithm.

6. A method for block chain message management, comprising:

receiving the encrypted common message and the all encrypted differential message through the blockchain;

decrypting one of the encrypted difference messages according to a private key of the user to obtain a difference message corresponding to the user and a preset encryption key;

decrypting the encrypted public message by using the preset encryption key to obtain a decrypted public message;

and obtaining the message to be issued of the message issuing node according to the public message and the obtained difference message.

7. The method according to claim 6, wherein before the step of decrypting one of the encrypted difference messages according to its own private key to obtain its corresponding difference message and a preset encryption key, the method further comprises:

and acquiring a public key of the message publishing node, and performing signature verification on the encrypted public message and all encrypted differential messages by using the public key.

8. A node apparatus, comprising:

one or more processors;

a first storage device having one or more programs stored thereon, which when executed by the one or more processors, cause the one or more processors to implement the blockchain message management method of any of claims 1-5.

9. A node apparatus, comprising:

one or more processors;

a second storage device having one or more programs stored thereon, which when executed by the one or more processors, cause the one or more processors to implement the blockchain message management method of claim 6 or 7.

10. A block link point system, comprising: the node device of claims 8 and 9.

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