A multi-party cooperative group signature method and device, system and medium based on sm2 algorithm

Abstract

The invention relates to the technical field of digital signatures, and more particularly, to a multi-party collaborative group signature method, device, system and medium based on the SM2 algorithm. The method includes: S1, group members, register with the trusted center to form a signature group; S2, group members, respectively generate signature private key components, and communicate with the trusted center to generate a common signature public key based on the secure computing protocol of the SM2 algorithm ; S3, the signature initiator sends a signature request, each team member generates a temporary public key and a temporary private key, and sends the temporary public key to the trusted center; S4, the trusted center, polls and communicates with the team members in turn, and the team members Using the temporary private key and the signature private key component, based on the SM2 algorithm to cooperate with the trusted center, the r signature components and the s signature components are calculated; S5, the trusted center, outputs the complete digital signature result (r, s). Each group member participates fairly in the signing process of the present invention, and the impostor of the participants can be effectively avoided through the trusted center.

Description

technical field [0001] The invention relates to the technical field of digital signatures, and more particularly, to a multi-party collaborative group signature method, device, system and medium based on the SM2 algorithm. Background technique [0002] In terms of information security, digital signatures are a very important part. Secure digital signatures determine the identity of the counterparty in electronic documents, electronic contracts and other applications, and are the basis for the authenticity of information. [0003] With the development of cryptography and computing technology, the commonly used 1024-bit RSA algorithm faces serious security threats. The State Cryptography Administration released the SM2 elliptic curve public key cryptography algorithm on December 17, 2010. Compared with the RSA algorithm, SM2 has more advantages in security and performance. [0004] In the public key cryptosystem, ensuring the security of the private key is a very important ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a multi-party collaborative group signature method based on the SM2 algorithm, a device, a system, and a medium, so as to solve the problem of low security in the prior art of collaboratively completing digital signatures between multiple participants

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