CN101419589B - Method and system for protecting computer document content - Google Patents

Abstract

The invention discloses a method and a system which are used for protecting document content of a computer, aiming at solving the problem that in the prior art, the efficiency is low when protection to the document content of the computer is carried out. The main technical proposal comprises the following steps: a security character font is established and comprises characters and security codes and the security codes of each character in the security character font and standard codes form one-to-one mapping relation; the mapping relation is stored in a code converting module; and the standard codes of the characters in the document of the computer is converted into the security codes according to the mapping relation and the security codes are stored. The technical proposal can realize automatic default protection of input and the existing document content of the computer, and simultaneously does not need to record keys separately, thereby reducing the encryption difficulty and improving the encryption efficiency.

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. the

Background technique

At present, the international coding standard ISO/IEC 10646:2003 that has been promulgated, as well as the national coding standards GB13000 and GB18030 to be promulgated, have included CJK unified Chinese characters, CJK unified Chinese character expansion set A, and CJK unified Chinese character expansion set B, with a total of 70195 characters . the

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. the

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. the

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. the

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. the

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

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

Extract the characters of the standard font and arrange them according to the standard encoding;

performing a linear operation on the standard code of the character in the standard font library and a preset value to obtain a security code of the character, or randomly assigning a security code to the character, and the security code of each character is different from each other;

Storing the characters and the security codes of the characters to form the security font library, the security font library includes characters and the security codes of the characters, the security code of each character in the security font library is the same as that of the characters The standard codes in the standard font form a one-to-one mapping relationship;

Store 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 encoding of the standard font into the secure encoding of the secure font according to the mapping relationship, and stored. the

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

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

The security font library is used to store characters and the security codes of the characters. The security code is to extract the characters of the standard font library, arrange them according to the standard codes, and standard code the extracted characters in the standard font library with preset values. Perform linear operations to obtain the security code of the extracted characters, or randomly give security codes to the extracted characters;

A coding conversion module, configured to store the mapping relationship between the security coding of the character and the standard coding of the character, and convert the coding of the character in the computer document from the standard coding according to the mapping relationship between the security coding and the standard coding Convert to secure encoding. the

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. the

Description of drawings

Fig. 1 is the schematic diagram of computer document content protection system in the 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. the

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. the

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

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

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 converts the character encoding from the standard encoding into a secure encoding, and the storage module is used to store the converted secure encoding of the characters in the computer document. the

Further, the standard font library is ISO/IEC 10646:2003 standard font library, and the safe font library is TrueType font library, PostScript font library or other user-defined format font library. the

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. the

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/IEC 10646:2003 coding system, and arrange them in ascending order according to the ISO/IEC 10646:2003 coding sequence. The characters can be Chinese characters, minority characters or other characters. the

Step 202, give 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, and the relationship between the security code of the character and the ISO/IEC 10646:2003 standard code mapping relationship between them. the

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. the

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

Step 204, storing the mapping relationship between the security code of the character and the ISO/IEC 10646:2003 standard code of the character in the code conversion module. the

Step 205, 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. the

Step 206, setting the safe font as the display font of the computer document. the

Step 207, when the computer file is opened, the characters of the computer file will be displayed according to the security code. the

Further, for example, the three characters "I love you", these three characters (me, love, you), are all existing Chinese characters included in the ISO/IEC 10646 standard. These three characters have been included in the existing international or national coding standards, and their ISO/IEC 10646 standard code values are 6211, 7231, and 4F60 respectively. After the three characters are coded and converted, they obtain a safe code, as shown in the table 1. the

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.

三个字 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 "鉖薠

three words

When the content of an existing computer document contains a line of unencrypted "I love you" characters with standard encoding, first determine what encoding system the document is in, and if it is not stored in ISO/IEC 10646 standard encoding, convert the content of the document to ISO /IEC 10646 standard encoding format, and then convert it into "鉖薠 The encoding of the three characters in the new safe font library.

。因此当非法用户非法获得该文档的时候，看到的只能是“鉖薠三个字，而不是加密前的“我爱你”三个字。 When the encrypted computer file is transmitted, only the file needs to be transferred. Legitimate users will pre-install the secure font, the encrypted document can correctly display the words "I love you" using this secure font, and the encrypted document will display ""鉖薠" if other fonts are used

. Therefore, when an illegal user obtains the document illegally, all he can see is "鉖薠 Three words, not the three words "I love you" before encryption.

This kind of safe font can be directly installed into Windows, MAC OS, Unix, Linux and other operating systems for users to use. 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. the

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, comprising: Extract the characters of the standard font and arrange them according to the standard encoding; performing a linear operation on the standard code of the character in the standard font library and a preset value to obtain a security code of the character, or randomly assigning a security code to the character, and the security code of each character is different from each other; Storing the characters and the security codes of the characters to form the security font library, the security font library includes characters and the security codes of the characters, the security code of each character in the security font library is the same as that of the characters The standard codes in the standard font form a one-to-one mapping relationship; 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 encoding of the standard font into the secure encoding of the secure font according to the mapping relationship, and stored. 2. The method of claim 1, further comprising: The safe font is set as a display font of the computer document, and the characters in the computer document are displayed according to the safe code of the safe font. 3. The method according to claim 1 or 2, characterized in that, when the characters in the computer document are input, the code of the input character is converted from the standard code in the standard font library into a safe code, and stored . 4. The method according to claim 1 or 2, characterized in that, when the computer document is converted, the encoding of the characters in the computer document is converted from the standard encoding of the standard font into a safe encoding and stored. 5. A system for protecting computer document content, characterized in that it comprises: A standard font library, used to store characters and standard codes of said characters; The security font is used to store characters and the security codes of the characters, the security code is to extract the characters of the standard font, arrange them according to the standard code, and encode the extracted characters in the standard font and the preset value Perform a linear operation to obtain a security code for the extracted characters, or a random security code for the extracted characters; A coding conversion module, configured to store the mapping relationship between the security coding of the character and the standard coding of the character, and convert the coding of the character in the computer document from the standard coding according to the mapping relationship between the security coding and the standard coding Convert to secure encoding. 6. The system of claim 5, further comprising: The storage module is used for storing the security code after character conversion in the computer document. 7. The system according to claim 5 or 6, wherein the secure font is also used as a display font for the computer document. 8. The system according to claim 5, wherein the standard font is an ISO/IEC10646:2003 standard font, and the safe font is a TrueType font or a PostScript font. the

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