Digital signature method based on CSK

Abstract

A digital signature method based on CSK establishes a digital signature checking center on the website for checking the signature file. A client computer is established with a ciphering system and a digital signature protocol. Each subscriber is distributed with a hardware device of the cipher key. A signature subscriber uses the cipher key for executing digital signature to the file. The digital signature protocol adopts a combined symmetrical cipher technique for executing digital signature to the file and realizes that the signature cipher is different each time. A signature checking subscriber also uses a cipher key for checking the signature file. The digital signature checking center firstly checks the identity of the signature checking subscriber, and subsequently executes the checking to the signature file. The identity checking protocol and the digital signature checking protocol are all completed with a combined symmetrical key technique thereby realizing the digital signature of the file and the checking to the signature file.

Description

Technical field: [0001] The invention relates to the field of information security and is used for digital signatures in the approval process of office automation documents. Background technique: [0002] At present, asymmetric cryptographic algorithms are used to establish digital signature systems at home and abroad, such as: PKI technology. However, the public key stored in the digital signature verification center of PKI technology is vulnerable to hackers. Hackers can impersonate by tampering with the user's public key. At the same time, the key for the user to digitally sign the file is: the cost of updating and maintaining the private key is high. In addition, the digital signature based on the asymmetric cryptographic algorithm and the verification of the signed file are slow. In short, the existing digital None of the signature products can meet the needs of the market. Invention content: [0003] The digital signature method based on CSK (Combined, Symmetric, Ke...

AI Technical Summary

Problems solved by technology

[0002] At present, asymmetric cryptographic algorithms are used to establish digital signature systems at home and abroad, such as: PKI technology. However, the public key stored in the digital signature verification center of PKI technology is vulnerable to hackers. Hackers can impersonate by tampering with the user's public key. At the same time, the key for the user to digitally sign the file is: the cost of updating and maintaining the private key is high. In addition, the digital signature based on the asymmetric cryptographic algorithm and the verification of the signed file are slow. In short, the existing digital None of the signature products can meet the needs of the market

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