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Digital abstract forming device and method, and CA signing system and method

A technology of digital digest and generating device, which is applied in the direction of user identity/authority verification, etc., can solve problems such as the influence of electronic signature use, and achieve the effect of reducing the probability of collision possibility

Active Publication Date: 2006-12-27
BEIJING SURSEN INT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a digest algorithm in use is really cracked, it will have a certain impact on the use of electronic signatures

Method used

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  • Digital abstract forming device and method, and CA signing system and method
  • Digital abstract forming device and method, and CA signing system and method
  • Digital abstract forming device and method, and CA signing system and method

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Embodiment Construction

[0027] like figure 2 As shown, the digital digest generating device 2 according to the first embodiment of the present invention includes an original information converter 21 and a digital digest calculator 22 . The original information converter 21 performs simple function processing on the input original information S, such as front-to-back swap, first odd digits and then even digits, shifting characters up by one, etc., to obtain transformed information S'. For example, assuming S=abcdefghijklmn, if the original information converter 21 performs the processing of the original information before and after swapping, then the obtained S'=nmlkjihgfedcba; , then the obtained S'=acegikmbdfhjln; if the original information converter 21 performs the process of shifting the character up by one on the original information, the obtained S'=bcdefghijklmno.

[0028] The original information converter 21 inputs the converted information S' into the digital digest calculator 22. The di...

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Abstract

The provided generator for digital abstract comprises: a converter for original information to take function transformation, and calculator for digital abstract with discrete algorithm. This invention can improve CA signature security.

Description

technical field [0001] The present invention relates to computer security protocol, digital certificate, electronic signature, CA and electronic signature products, and e-commerce fields such as finance and securities, and in particular to a digital abstract generation device and method, and a CA signature system and method with the device. Background technique [0002] Hashing is to convert a piece of data of any length into a piece of fixed-length, irreversible data by applying a one-way hash function to information. This string of digested data is also known as a message digest or digital digest or digital fingerprint. The length of the resulting hash value should be long enough so that there is little chance of finding two pieces of data with the same hash value. MD5 and SHA-1 are the two most commonly used hash functions. They are the key technologies in international electronic signature and many other cryptographic application fields, and are widely used in e-commerc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/32
Inventor 王东临
Owner BEIJING SURSEN INT TECH CO LTD
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