A file signature method, device, electronic equipment and readable storage medium

Abstract

The embodiment of the present invention provides a file signature method, device, electronic equipment and readable storage medium. The method includes: calculating the information digest value of the target file according to a preset information digest algorithm; obtaining private keys and public keys of multiple signers; according to preset signature rules, using multiple private keys corresponding to multiple signers to pair information The digest value is encrypted and calculated to obtain the joint digital signature of multiple signers; the joint digital signature of multiple signers, information digest value and multiple public keys corresponding to multiple signers are correspondingly stored in the blockchain distributed ledger ; Write signature tags carrying multiple public keys in the target file, and the multiple public keys in the signature tags are arranged in the order of decrypting the joint digital signature. In this way, joint digital signatures of target files by multiple signers can be realized. In addition, storing the digital signature in the blockchain distributed ledger can ensure the validity of the joint digital signature and improve data security.

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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