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 following steps: after opening a target file,receiving an ownership change instruction which is sent by a changer and aims at the target file; performing encryption calculation on a second public key of the second user by using a private key input by a modifier to obtain a second digital signature; based on the first public key and the second digital signature, verifying whether the modifier has the authority of changing the ownership of thetarget file or not; if so, performing encryption calculation on the information abstract value by using a second private key to obtain a third digital signature; and correspondingly storing the second public key, the information abstract value, the third digital signature, the first public key and the second digital signature into a block chain distributed account book. Thus, when the modifier has the ownership change permission, the ownership of the target file can be changed into the second user. And the validity of the 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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