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: after opening the target file, receiving an ownership change instruction for the target file issued by the changer; using the private key input by the changer to encrypt and calculate the second user's second public key to obtain a second digital signature; The first public key and the second digital signature verify whether the changer has the authority to change the ownership of the target file; if so, use the second private key to encrypt and calculate the information digest value to obtain the third digital signature; use the second public key, The information digest value, the third digital signature, the first public key and the second digital signature are correspondingly stored in the blockchain distributed ledger. In this way, when the changer has ownership change authority, the ownership of the target file can be changed to the second user. And it can ensure the validity of the digital signature and improve the security of the data.

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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