Multi-party collaborative group signature method, device and system based on SM2 algorithm, and medium

Abstract

The invention relates to the technical field of digital signatures, in particular to a multi-party collaborative group signature method, device and system based on an SM2 algorithm, and a medium. Themethod comprises the following steps: S1, group members register to a trusted center to form a signature group; S2, the group members respectively generate signature private key components, and communicate with the trusted center to generate a common signature public key based on a security computing protocol of an SM2 algorithm; S3, a signature initiator sends a signature request, and each groupmember generates a temporary public key and a temporary private key and sends the temporary public key to the trusted center; S4, the trusted center is in polling communication with the group membersin sequence, and the group members use the temporary private key and the signature private key component to perform cooperative signature with the trusted center based on the SM2 algorithm to calculate an r-term signature component and an s-term signature component; and S5, the trusted center outputs a complete digital signature result (r,s). According to the invention, each group member participates fairly in the signature process, and the famous substitution of participants is effectively avoided through the trusted center.

Description

technical field [0001] The present invention relates to the technical field of digital signatures, and more specifically, to a multi-party cooperative group signature method based on the SM2 algorithm, a device, a system, and a medium. Background technique [0002] In terms of information security, digital signature is a very important part. Secure digital signatures determine the identity of the other party in applications such as electronic documents and electronic contracts, and are the basis for authentic information. [0003] With the development of cryptography and computing technology, the commonly used 1024-bit RSA algorithm is facing 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 terms of security and performance. [0004] In the public key cryptosystem, ensuring the security of the private key is a v...

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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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