Method for generating SM9 digital signature through multi-party association under symmetrical environment

Abstract

The invention discloses a method for generating a SM9 digital signature through multi-party association under a symmetrical environment. The method comprises a plurality of participants, and comprisesthe following steps: a key generation center KGC generates master public and private keys; the KGC issues some private keys for all the participants; all the participants associates to sign, then, the generated signature is verified through a digital signature verification algorithm of the SM9, and if the signature passes through verification, the SM9 signature about a message M is published. With the method provided by the invention, generation of the SM9 digital signature through multi-party association is realized, each participant in a signing process is guaranteed not to expose some private keys, meanwhile, signing of the digital signature should be participated by all the participants, thus, security and fairness of multi-party signing are realized.

Description

technical field [0001] The invention relates to information security technology, in particular to a method for jointly generating SM9 digital signatures by multiple parties in a symmetrical environment. Background technique [0002] Digital signature is an important part of information security technology. Similar to the function of a physical signature or seal, a digital signature is actually a set of electronic data that only the sender can generate. It has important applications in identity authentication, data integrity, non-repudiation, and anonymity. On the one hand, the use of digital signatures can verify that the sender of the information is legal and non-repudiable, that is, entity authentication; on the other hand, it can also verify the integrity and effectiveness of the content of the sent message, that is, communication data security. In a digital signature system, the basis for identity authentication is the binding of public / private keys to the user's physic...

AI Technical Summary

Problems solved by technology

[0004] 1. Regarding the security of the private key, although the current threshold secret sharing scheme can divide the private key, the private key will be recovered and held by a certain party during the signature phase, resulting in the leakage of the private key. Reduced multi-signature security

[0005] 2. Regarding the fairness of signatures, in the existing threshold secret sharing scheme, the party who finally holds the complete private key can sign independently without all participants participating together, which reduces the fairness of multi-party signatures

[0006] It can be seen that the implementation method based on secret sharing has weak protection for the signature key, and there is a hidden danger of key leakage.

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