File signature method and device, electronic device and readable storage medium

Abstract

The embodiment of the invention provides a file signature method and device, an electronic device and a readable storage medium. The method comprises the steps of calculating an information abstract value of a target file according to a preset information abstract algorithm; acquiring private keys and public keys of a plurality of signers; according to a preset signature rule, performing encryption calculation on the information abstract value by using a plurality of private keys corresponding to the plurality of signers to obtain a joint digital signature of the plurality of signers; correspondingly storing the joint digital signatures and the information abstract values of the plurality of signers and the plurality of public keys corresponding to the plurality of signers into a block chain distributed account book; and writing a signature mark carrying a plurality of public keys into the target file, wherein the plurality of public keys in the signature mark are arranged according toa decryption joint digital signature sequence. Therefore, the joint digital signature of a plurality of signers to the target file can be realized. And besides, the digital signature is stored in theblock chain distributed account book, so that the effectiveness of the joint digital signature can be ensured, and the security of the data is improved.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a file signature method, device, electronic equipment and a readable storage medium. 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 val...

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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