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 determining a target file, and calculating a first information abstract value of the target file according to a first information abstract algorithm; obtaining a private key and a public key of a signer; wherein the private key is a second information abstract value obtained by performing information abstract calculation on the feature picture carrying the biological feature of the signer; performing encryption calculation on the first information abstract value by using a private key to obtain a digital signature; correspondingly storing the digital signature, the first information abstract value and the public key into a blockchain distributed account book; and writing a signature mark into the target file. Since the private key is calculated based on the biological characteristics of the signer, binding of the signer andthe digital signature can be realized. Moreover, 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 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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