Method for generating SM2 blind signature through cooperation of two parties

Abstract

The invention discloses a method for generating an SM2 blind signature through cooperation of two parties, provides a two-party blind signature system suitable for a cloud environment by applying the method for generating the SM2 blind signature through cooperation of the two parties, and particularly relates to the technical field of passwords. The method comprises four stages of system parameter establishment, partial private key and signature verification public key generation, signature generation and signature verification. According to the method, two parties except the user are allowed to participate in blind signature operation together, the user can select corresponding signers according to different application requirements, and by means of safe and efficient computing service of the cloud server, local storage consumption is reduced, computing cost is saved, and collaborative blind signature operation is carried out in a distributed environment with unbalanced computing resources; by adding signature participants, the possibility of signature counterfeiting caused by secret key leakage is reduced, the attack cost is increased due to scattered storage of secret keys, and the security of the signature secret keys can be improved; by using the blind signature property, the signature participants cannot predict the content of the original message, so that the message privacy is protected.

Description

technical field [0001] The present invention relates to the technical field of cryptography, and more specifically, the present invention relates to a method for two parties to cooperate to generate an SM2 blind signature. Background technique [0002] In the public key cryptosystem, the key is the credential used to confirm the user's identity and ensure that the user has relevant permissions. Digital signature technology is an important branch of public key cryptography. The safe storage and reasonable use of signature keys are the basic requirements to ensure the legal validity of signatures. However, with the popularization and application of the Internet in recent years, the generation of massive information has increased the difficulty of data storage and data management, and information leakage incidents have occurred frequently, and personal information has become the object of transactions. Similarly, the signature key is usually at risk of being lost because it is...

AI Technical Summary

Problems solved by technology

For the two-party application scenario of the SM2 digital signature algorithm, the currently proposed scheme can realize the two-party collaborative signature function based on SM2 alone or the blind signature function based on SM2. The former cannot meet the needs of message privacy protection, and the latter cannot meet the two-party participation Signed Application Requirements

Secondly, in the existing scheme, users consume a lot of computing resources when performing signature operations, which is not suitable for local environments with limited computing power and limited storage space.

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