CN101840483B - A kind of method and system of protecting computer document content - Google Patents

Abstract

The invention discloses a method and a system for protecting computer document content, which are used to solve the problem of low efficiency existing in the prior art for computer document content protection. The main technical solutions include: establishing a safe font library and storing it in the network server; the security code of each character in the safe font library forms a mapping relationship with the standard code and stores it in the code conversion module; the characters in the computer document are converted from the standard code according to the mapping relationship It is converted into secure code storage, and the secure font is set as the display font of the computer document; when the computer opens the document, it obtains the secure font from the network server, and the characters in the document are displayed according to the secure code of the secure font. Through this technical scheme, automatic default protection of computer document content can be realized, and at the same time, no separate key is recorded, encryption difficulty is reduced, encryption efficiency is improved, and the computer document transmission does not need to transmit a safe word library.

Description

Method and system for protecting computer document content

technical field

The invention relates to the technical field of computer information processing, in particular to a method and system for protecting computer document content.

Background technique

At present, in the international coding standard ISO/IEC10646:2003 that has been promulgated, and the national coding standards GB13000 and GB18030 that will be promulgated soon, CJK unified Chinese characters, CJK unified Chinese character extension set A, and CJK unified Chinese character extension set B have been included, with a total of 70,195 characters.

Various standard fonts generated according to these coding standards are used in the display of various computer documents, such as documents in WORD format. However, the content of various computer documents uses real standard codes, which not only facilitates transmission and information exchange, but also brings problems of resource loss and content leakage.

However, the existing method of encrypting computer documents using document passwords is not easy to distribute and record on a large scale due to potential safety hazards such as password leakage security and key leakage security.

If the format of PDF or picture is used to store and transmit computer documents, the content of the computer document cannot be retrieved and located arbitrarily, and the format of PDF or picture will make the computer document larger, increasing the transmission cost.

Contents of the invention

The invention provides a method and a system for protecting computer document content, which are used to solve the problem of low efficiency existing in the prior art when performing content protection on computer documents.

Embodiments of the present invention are realized through the following technical solutions:

An embodiment of the present invention provides a method for protecting computer document content, including:

Extract the characters of the standard font, arrange them according to the standard codes, and perform linear operations on the standard codes of the characters in the standard font and the preset values to obtain the security codes of the characters, or randomly assign security codes to the characters , and the security codes of each character are different from each other, and the characters and the security codes of the characters are stored to form a security font, the security font includes characters and the security codes of the characters, each in the security font The security code of a character forms a one-to-one mapping relationship with the standard code of the character in the standard font library;

Storing the safe font library in the network server;

storing the one-to-one mapping relationship between the security code of the character and the standard code of the character in the code conversion module;

The characters in the computer document are converted from the standard code of the standard font to the security code of the security font for storage according to the mapping relationship, and the security font is set as the display font of the computer document;

When the computer opens the computer document, the computer acquires the secure font library from the network server;

The characters in the computer document are displayed according to the security code of the security font.

The embodiment of the present invention also provides a system for protecting computer document content, including:

A standard font library, used to store characters and standard codes of said characters;

A safe font library, used to store characters and safe codes of the characters; wherein, the safe font library is obtained by: extracting the characters of the standard font library, arranging them according to standard codes, and standardizing the characters in the standard font library The code and the preset value are linearly operated to obtain the security code of the character, and the security code can also be randomly given to the character, and the security code of each character is different from each other, and the security code of the character and the character The code is stored to become the safe font, and the safe code of each character in the safe font forms a one-to-one mapping relationship with the standard code of the character in the standard font;

A code conversion module, configured to store the mapping relationship between the security code of the character and the standard code of the character, and convert the code of the character from the standard code to the security code according to the mapping relationship between the security code and the standard code ;

The network server is used to store the safe font;

The computer is configured to obtain the secure font from the network server when opening the computer document, and display the characters in the computer document according to the security code of the secure font.

Through the above technical solution, the present invention adopts the secure font library through the code conversion module, and can perform secure code conversion on the computer document to be entered or the existing computer document to achieve the purpose of disrupting storage, and only need to specify the secure font library as the computer file during transmission. By displaying the font by default, the content of the normal document can be displayed automatically, and if a font other than the safe font is used for display, the computer document will be displayed as a random document with no practical meaning. Adopting the safe font of the present invention can realize the automatic default protection of the contents of the entered and existing computer documents, and at the same time, there is no need to record the key separately, which reduces the difficulty of encryption and improves the encryption efficiency. The safe font can be widely used in computers Document content security protection domain. Moreover, when the computer displays the computer document, it can obtain the secure font from the network server, so that it is not necessary to carry the secure font when transmitting the computer document, which reduces the burden of network transmission.

Description of drawings

FIG. 1 is a schematic diagram of a computer document content protection system in an embodiment of the present invention;

Fig. 2 is a flow chart of implementing protection of computer document content in an embodiment of the present invention.

Detailed ways

In order to improve the efficiency of computer document content protection, the embodiment of the present invention proposes a method and system for computer document content protection. The main realization principle, specific implementation process and corresponding attainable results of the embodiment of the present invention will be described below in conjunction with the accompanying drawings. The beneficial effects are described in detail.

In the embodiment of the present invention, the code corresponding to the characters in the content of the computer document is converted from the standard code into a security code that is different from the standard code but is mapped one-to-one with the standard code, and the computer file is stored and transmitted in a secure coded manner In this way, when the computer document is opened with a standard font, the content of the computer document will display meaningless characters; if the safe font is used as the display font of the computer document, it can display the correct content of the computer document when it is entered, thereby ensuring The content of computer documents will not be leaked.

The embodiment of the present invention provides a protection system for computer document content, as shown in FIG.

The standard font library is used to store characters and their standard codes, the security font library is used to store characters and their security codes, and the code conversion module is used to store the mapping relationship between character security codes and character standard codes, and according to the security code The mapping relationship with the standard encoding, the character encoding is converted from the standard encoding to the safe encoding, the network server is used to store the safe font, the computer obtains the safe font from the network server, and displays the computer document, and the storage module is used to store the character conversion in the computer document After the security code.

Further, the standard font library is ISO/IEC10646:2003 standard font library, and the safe font library is TrueType font library, PostScript font library or other user-defined format font library.

Further, the safe font can be set as the display font of the computer document, so that when the computer document is opened, the computer document will be displayed according to the safe code of the safe font.

Embodiments of the present invention also provide a method for protecting computer document content, the specific process of which is shown in Figure 2, including the following steps:

Step 201, extract all characters in the standard font library defined by the existing ISO/IEC10646:2003 coding system, and arrange them in ascending order according to the ISO/IEC10646:2003 coding sequence. The characters can be Chinese characters, minority characters or other characters.

Step 202, giving these characters a security code that is different from the standard code but uniquely corresponding to the standard code, and simultaneously record the security code of the character and the affiliation of the character, as well as the relationship between the security code of the character and the ISO/IEC10646:2003 standard code mapping relationship.

In this step 202, a variety of ways can be adopted to obtain the security code of the character, such as performing a linear operation on the standard code of a certain character with a preset value to obtain the security code of the character; coding.

Step 203, storing these characters and their security codes to generate a security font library. The safe font can be a TrueType font or a PostScript font, or can be a user-defined character format. The secure font library may also include compressed font data and corresponding font curve Hint fine-tuning instruction information.

Step 204, storing the safe font library in the network server.

Step 205, storing the mapping relationship between the security code of the character and the ISO/IEC10646:2003 standard code of the character in the code conversion module.

Step 206, the code conversion module converts the characters in the computer document from the standard code of the standard font into the security code of the safe font according to the mapping relationship, and stores them.

Step 207, setting the safe font as the display font of the computer document.

Step 208, when the computer opens the computer document, the computer obtains the secure font library from the network server.

Step 209, the characters of the computer document will be displayed according to the security code.

Furthermore, for example, the three characters "I love you", these three characters (me, love, you) are all existing Chinese characters included in the ISO/IEC10646 standard. These three characters have been included in the existing international or national coding standards, and their ISO/IEC10646 standard code values are 6211, 7231, and 4F60 respectively. After these three characters are coded and converted, they obtain a safe code, as shown in Table 1 .

Table 1

The characters and their corresponding security codes form a security font library, and the mapping relationship between the security codes and the corresponding standard codes is stored in the code conversion module.

The user opens a new document, sets the security font as the display font, starts the system's own input method to send the standard code sequence "I love you", that is, the standard code sequence is 6411, 7231, 4F60, and the input device receives the standard code sequence "I love you". After "love you", the three standard characters of "I love you" are converted into the security code sequence 9256, 85A0, 201A6 of the security font by the code conversion module. "I love you" three words, but its coding sequence is the coding sequence 9256, 85A0, 201A6 of the safe font. At this time, if the document is displayed using the standard coded font library, it will be displayed as the three characters "鉖薠□".

When an existing computer document contains a line of standard-encoded unencrypted "I love you" characters, first determine which encoding system the document is in, and if it is not stored in the ISO/IEC10646 standard encoding, convert the document content to ISO/IEC10646 IEC10646 standard coding format, and then use the corresponding relationship between the security code and the ISO/IEC10646 standard code to convert it into the code of the three characters "鉖薠□" in the new security font library.

When the encrypted computer file is transmitted, only the file needs to be transferred. Legal users will obtain the secure font from the network server and pre-install the secure font. The encrypted document can correctly display the words "I love you" using this secure font. If the encrypted document uses other fonts, it will be displayed as ""鉖薠□" Therefore, when illegal users illegally obtain the document, they can only see the three words "鉖薠□", instead of the three words "I love you" before encryption.

This kind of safe font is installed on the network server, so that when the computer document is transmitted, it is no longer necessary to carry the safe font at the same time, thereby reducing the burden of network transmission. After installing the secure font library, the content of various documents can be encrypted by using the corresponding relationship between the secure code of characters and the ISO/IEC10646 standard code.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (8)

1. a method for protecting computer document content, is characterized in that, comprising:

The character of extraction standard character library, arrange according to standard code, described character is carried out linear operation at described standard character library Plays coding with the numerical value preset, obtain the safe coding of described character, also safe coding can be given at random to described character, and the safe coding of each character is different, by described character, the safe coding of described character stores, become safe word stock, described safe word stock comprises the safe coding of character and described character, in described safe word stock, the safe coding of each character and the standard code of described character in standard character library form man-to-man mapping relations,

Described safe word stock is stored in the webserver;

Mapping relations one to one between the safe coding of described character and the standard code of described character are stored in transcoding module;

Character in described computer document is according to described mapping relations, and the safe coding converting described safe word stock from the standard code of described standard character library to stores, and described safe word stock is set to the display character library of described computer document;

When described computer document opened by computing machine, described computing machine obtains described safe word stock from the described webserver;

Character in described computer document shows according to the safe coding of described safe word stock.

2. the method for claim 1, is characterized in that, described safe word stock also comprises the font data after compression and corresponding font curve Hint finely tunes command information.

3. the method as described in any one of claim 1 to 2, is characterized in that, the character in described computer document, when inputting, converts the coding of the described character of input to safe coding from the standard code standard character library, and stores.

4. the method as described in any one of claim 1 to 2, is characterized in that, described computer document, when changing, by the coding of the character in described computer document, converts safe coding to from the standard code of standard character library, and stores.

5. a system for protecting computer document content, is characterized in that, comprising:

Standard character library, for the standard code of store character and described character;

Safe word stock, for the safe coding of store character and described character, wherein, described safe word stock obtains in the following manner: the character extracting described standard character library, arrange according to standard code, described character is carried out linear operation at described standard character library Plays coding with the numerical value preset, obtain the safe coding of described character, also safe coding can be given at random to described character, and the safe coding of each character is different, by described character, the safe coding of described character stores, become described safe word stock, in described safe word stock, the safe coding of each character and the standard code of described character in described standard character library form man-to-man mapping relations,

Transcoding module, for storing the mapping relations between the safe coding of described character and the standard code of described character, and according to the mapping relations of safe coding and standard code, converts the coding of described character to safe coding from standard code;

The webserver, for storage security character library;

Computing machine, for when opening described computer document, obtains described safe word stock from the described webserver, and is shown according to the safe coding of described safe word stock by the character in described computer document.

6. system as claimed in claim 5, is characterized in that, also comprise:

Memory module, for storing the safe coding in described computer document after character conversion.

7. the system as described in any one of claim 5 to 6, is characterized in that, described safe word stock is also for the display character library as described computer document.

8. system as claimed in claim 5, it is characterized in that, described standard character library is ISO/IEC10646:2003 standard character library, and described safe word stock is TrueType character library or PostScript character library.