File signature processing system

Abstract

The embodiment of the invention provides a file signature processing system. The system comprises a signature device and a signature verification device. The signature device is used for determining atarget file to be digitally signed and calculating a first information abstract value of the target file, obtaining a first private key and a first public key of the signer, performing encryption calculation on the first information abstract value by using a first private key to obtain a first digital signature, and correspondingly storing the first digital signature, the first information abstract value and the first public key into a block chain distributed account book. The signature verification device is used for calculating a second information abstract value of the target file when a verification instruction is received, judging whether a second information abstract value exists in the block chain distributed account book or not, and if not, determining that the target file is tampered. Thus, the digital signature can be stored in the block chain distributed account book, so that the validity of the digital signature is ensured, and the security of the data is improved. And thedigital signature can be verified, so that whether the file is tampered or not can be verified.

Description

technical field [0001] The invention relates to the technical field of computers, in particular to a file signature processing system. Background technique [0002] File signing refers to digitally signing files. Among them, the digital signature is some data attached to the file, and the digital signature is often attached at the end of the file. In this way, the receiver of the file can verify according to the additional data: whether the file is indeed sent by the signer, and whether the file content of the file has been tampered with. [0003] For example, Zhang San uses his private key to digitally sign file A. Wherein, the digital signature is written at the end of the signed file A. Then, Zhang San sends the signed document A to Li Si. After Li Si receives the signed file A, he can use Zhang San's public key to decrypt the digital signature. If Li Si can use Zhang San's public key to decrypt and obtain the hash value of file A, it proves that file A was indeed se...

AI Technical Summary

Problems solved by technology

[0004] However, this method of attaching the digital signature to the file makes the digital signature easy to be tampered by malicious users, and cannot guarantee the validity of the digital signature, thus threatening the security of user data

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