WO2009039689A1

WO2009039689A1 - Abstracting method for computer plain text character

Info

Publication number: WO2009039689A1
Application number: PCT/CN2007/003394
Authority: WO
Inventors: Jianming Wu
Original assignee: Jianming Wu
Priority date: 2007-09-24
Filing date: 2007-11-30
Publication date: 2009-04-02
Also published as: CN101122897A

Abstract

An abstracting method for computer plain text character is disclosed. The method includes: when abstracting the plain text character from a computer electronic file, making a consistency filtering replacement to multiple codes representing the visual characters with one meaning in the plain text character of the original electronic file by using the computer character code, thereby making each visual character representing one meaning in the file plain text character after abstracted has only one zone bit code (internal code) or one computer character code representing manner.

Description

Method for extracting computer plain text characters

The present invention relates to a method for extracting computer plain text characters, and more particularly to a method for extracting computer plain text characters for an electronic file that uses a computer to edit and print paper documents. Background technique

With the popularization of computer technology, people use a large number of electronic files in various formats to express their thoughts and meanings. At the same time, they also use various digital printing machines (such as printers) under computer control to simultaneously print electronic files of these different formats. Make paper documents for preservation and communication.

For example, when two companies sign an economic contract, they first draft an electronic file with text content on the computer. After the two parties agree, they use digital printing machines (such as laser printers) to print the contract to paper. On the other hand, both parties stamped and stamped the paper documents as valid credit documents.

In the mutual expression of ideas and meanings, people need to prove the true meaning of their meaning, for example, the seal of the above contract.

In the information age, computer electronic files that are used in large quantities also need to be verified for authenticity. Since the mid-1990s, digital signature techniques consisting of hash functions and asymmetric key systems have been widely used in the world for computer electronic files. Verification of authenticity, for this reason, countries have successively enacted laws concerning the digital signature verification of electronic documents. In 2005, China's "Electronic Signature Law" was issued and implemented, which promoted the application of digital signature technology in the authenticity verification of electronic documents.

Electronic documents are computer representations of people's thoughts and meanings. Because electronic files are easily lost, such as: computer virus damage, computer data storage media shields, short life, human damage, and other unforeseen factors are easy. It causes the loss of computer electronic files. Therefore, in many cases, it is necessary to rely on paper documents to record the same thought and meaning.

Computer electronic documents and paper text printed by computer-controlled digital printing machinery The pieces use the language and characters formed by humans for thousands of years for people to read.

The computer uses code to represent these language literals, such as: decimal ASC II character codes used in computers, hexadecimal Unicode character codes, and hexadecimal national standard Chinese character codes.

Digital signature technology authenticates an authenticity of an electronic document, but only a collection of computer character code sets that make up the electronic file. Such as: "(1) I am Chinese" is composed of 7 characters, namely "(1),,, "half-width space", "I am Chinese" 5 Chinese characters. When authentication, the computer only needs to represent these characters. The set of computer code can be, ie: "(1)" is the bracketed alphanumeric code "A2C5", "half-width space" code "0020", "I" code "CED2", "Yes" code "CAC7", " In the "code" D6D0", "country" code "B9FA,,, "person" code "C8CB,,, the set is a hexadecimal array of "A2C50020CED2CAC7D6D0B9FAC8CB".

Since computer technology is developed from an English-speaking country to a multi-language country, in computer character sets, there are many meanings of visual characters with multiple location codes, for example: English alphanumeric characters have half-width and full-width input. Corresponding to the representation method, there are two location codes (internal codes) corresponding to one meaning of alphanumeric characters; at the same time, in order to facilitate computer input and improve the speed of text symbol entry, in the character input method design, there are also multiple The symbol set is a processing method of one symbol.

To retrieve the Chinese character set of the Chinese standard cylinder, there are the following types of confusing character codes: For example: The full-width alphanumeric code of "." is "A3AE", and the "." half-width alphanumeric code is "002E".

For example: "3" is the character represented by a code of "A2B3", and "3" is composed of ".", which is represented by the code "0033" and ".," which is represented by the code "002E".

Such as: "(1) I am Chinese" "(1), is a code "A2C5" in the sentence; and "(1)" can be composed of 3 characters" (,,, " 1 The code "0028 0031 0029" of , , , " )" is indicated.

For example, there are many spaces in a file. In the computer character set, spaces have two forms: "half-width space" and "full-width space", which are represented by codes "0020", "A1A1", and so on.

Another example: We use the computer to input characters with "Unicode (hex)" With the "cylinder Chinese GB (hex)" two character code table, the same Chinese character is different in the different character code table, the code "I" in Unicode (hexadecimal) is "6211"" , the code in Simplified Chinese GB (hex) is "CED2".

In computer electronic files, these characters can be easily distinguished by using a character area code or an internal code; however, when these characters are printed on paper by a computer-controlled digital printing machine, as expressed in this document, The visual form of a character is incapable of recognizing its representation of computer code. Similarly, on a printed paper file, it is impossible to determine how many computer space characters are there. There are several full-width spaces and several half-width spaces in these space characters. We can't distinguish them.

"(1) I am Chinese" is printed on paper. If we want to verify the authenticity of this sentence on paper by computer digital signature technology, we need to re-enter the character code of this sentence into the computer. In the hash function, the operation is performed; because of the "(1), there are two kinds of computer character representation methods in this sentence, the code set consisting of two different groups: One set is: "A2C5 0020 CED2 CAC7 D6D0 B9FA C8CB" , 7 codes; another group: "0028 0031 0029 0020 CED2 CAC7 D6D0 B9FA C8CB" , 9 codes;

If using a different character set, in "Unicode (hex)" "I am Chinese, the code for 5 words is: "6211 662F 4E2D 56FD 4EBA"

The code for the five words in "Chinese GB (hex)" is: "CED2 CAC7 D6D0 B9FA C8CB',.

Symbols that are easy to discriminate are intertwined with different character sets. "(1) I am Chinese" This sentence will produce 4 different combinations of codes. If there are many characters in a file, the code combination will not be counted. number.

The result of the different character code (internal code) set data in the hash function is completely different. Authenticity certification of the text content.

Due to the historical development of computer technology, this mixed character code representation method in computer information processing has made it difficult for digital signature technology to perform authenticity verification on the text content recorded in paper documents, thus making electronic documents Certification and use The certification of the paper documents printed by the electronic document is completely out of touch, which has formed the problem of difficulty in authenticating the paper file content that is currently ubiquitous. Once the fake and forged fake credit documents appear, only the conventional physical and chemical inspection methods can be used, but cannot be used. Digital computer digital signature technology authenticates the authenticity of paper document content.

This is the accompanying calculation;

Worldwide problem

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Is the authenticity of the computer-printed paper document certified? The two kinds of file forms of the electronic file and the paper file under the meaning of one person are unified in a digital signature technology system certification, so that the modern computer information expression form has the same safety certification technology guarantee as the traditional human credit representation form. The formation of an orderly social politics, economic order to provide technical support for the authenticity of documents, this is a worldwide problem of document security certification that needs to be resolved. Summary of the invention

In order to solve the above problems and technical defects, the present invention provides a method for extracting computer plain text characters, and by extracting, filtering, and filtering the computer character set character codes, when extracting plain text characters of computer electronic files, the computer characters are The multiple code representations are attributed to a code representation method, in which the filtered plain text characters are digitally signed data sources, and the digital signature data is recorded in the paper file, thereby improving the fault tolerance of the paper file text content input. On the basis of not changing the existing habits of people using computers and the established international character standards, the authenticity verification of the digital signature of the text content recorded in the paper media files edited and printed by the computer is effectively performed.

The invention is achieved by the following technical solutions:

When extracting plain text characters in a computer electronic file, the computer character code is used to perform consistency filtering on the plurality of location codes of the visual characters representing a meaning in the plain text characters in the original electronic file, so that the extracted files are in plain text characters. Each visual character that represents a meaning has only one location code (internal code) or code.

When extracting a plain text character of an electronic file, you can do the following:

Use a full-width and half-width character code to represent a visual character, all Expressed in half-width character code.

A full-width and half-width character code is used to represent a visual character of a meaning, all represented by a full-width character code.

Combining more than two visual characters together uses a single code to represent a visual character of a meaning, split into more than two visual characters, and is represented by its character code.

Delete all half-width space characters and full-width space characters in electronic files. detailed description

The present invention relates to a method for extracting computer plain text characters. The following describes in detail how the present invention is implemented:

A character filtering correspondence table is established according to the technical solution of the present invention.

Technical implementation steps for printing paper documents:

Step 1: According to the character filtering method of the file of the present invention, all characters of different computer character sets are subjected to corresponding analysis and screening, and a computer character set corresponding filtering table is established.

Step 2: Obtain an electronic file to extract all plain text characters from the electronic file. Step 3: The computer automatically retrieves the character code, and performs consistent filtering on the character according to the character filtering correspondence table to form a new plain text character.

Step 4: Use the new plain text character as the data source and input a hash function (for example: SHA-1 dedicated hash function) to get the hash value.

Step 5: Digitally sign the hash value using an asymmetric key, such as a digital certificate for the RSA or ECC key system, to derive the digital signature value.

Step 6: Record the hash value and the digital signature value in the selected area on the paper file to be printed, for example, on the stamp.

Step 7: Print the paper document in the original format in the electronic file.

The verification procedure of the authenticity of the paper documents printed by the above method is as follows: Prerequisite: The electronic file corresponding to the paper document has been lost, only one paper document cannot be matched with the electronic document for matching verification; or the electronic device has no condition to be matched. file.

The first step: the input personnel in the text in accordance with their own input habits in the computer Re-enter all the characters in the paper file.

Step 2: The computer automatically retrieves the character code, and performs consistent filtering on the character according to the character filtering correspondence table to form a new plain text character.

Step 3: Extract the hash value and digital signature value recorded in the paper file.

Step 4: Use the same hash function to compute new plain text characters to get the hash value. Step 5: Compare the hash value recorded on the paper file with the hash value obtained from the new operation. If the content of the file is consistent, the content of the file is unchanged.

Step 6: Decrypt the digital signature value using the public key of the original digital certificate user. The value obtained should be the hash value of the fourth step when printing the paper file. Compare the third and fourth steps in the verification of authenticity. 2 sets of hash values, the same is true, and the inconsistency is ^ ί艮.

The invention has the advantages of standardizing the inconsistency of the character codes that may occur when the computer is entered by different people and multiple times, so that the paper document can be verified by the digital signature technology on the basis of character consistency, and is a paper credit. Technical support for effective anti-counterfeiting certification of documents.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. All modifications are intended to be included within the scope of the invention, and the scope of the invention should be construed as the scope of the claims.

Claims

Rights request:

1. A method for extracting a plain text character of a computer, characterized in that, when extracting a plain text character in a computer electronic file, a computer character code is used to perform a plurality of location codes of a visual character representing a meaning in a plain text character in the original electronic file. Consistent filtering replaces, so that each of the extracted plain text characters represents a meaning visual character with only one location code or a computer character code representation.

The method for extracting computer plain text characters according to claim 1, wherein a full-width and half-width character code is used to represent a visual character of a meaning, all of which are represented by a half-width character code.

3. The method of extracting computer plain text characters according to claim 1, wherein a full-width and half-width character code is used to represent a visual character of a meaning, all of which are represented by a full-width character code.

4. The method for extracting computer plain text characters according to claim 1, wherein two or more visual characters represented by independent codes are grouped together using a visual character represented by a code, and is separated into original ones. Independent visual characters, and are represented by their original character codes, respectively.

5. The method of extracting computer plain text characters according to claim 1, wherein all half-width space characters and full-width space characters in the electronic file are deleted.