基于SM2的周期性可否认环签名方案

Periodically Deniable Ring Signature Scheme Based on SM2 Digital Signature Algorithm

周期性可否认环签名通过引入时间周期的概念,允许环成员在每个时间周期结束后选择性地否认自己在环中的签名者身份。这种周期性的变换提供了一种自主可控的机制,使得环成员能够更好地保护自己的隐私,同时还能与监管机构进行合法协作。一般数字签名具有不可否认性,可用于确保签名的来源、内容的完整性和认证性,而可否认签名具有可否认性,环成员能够在无可信第三方的情况下确认或者否认自己是否为该签名的签署者。文章在包子健等人提出的基于SM2的可否认环签名方案的基础上提出一种基于SM2的周期性可否认环签名方案,能够实现对签名的周期性确认与否认功能,有效保护自己的隐私信息。文章通过形式化证明方式证明了方案满足正确性、不可伪造性、匿名性、可追踪性和不可诽谤性。

Periodically deniable ring signature enables ring members to deny their identity selectively as signers within the ring after each time period.This transformation,implemented periodically,established a self-controlled mechanism,enhancing the privacy protection for ring members while also fostering cooperation with regulatory authorities.Traditional digital signatures possess non-repudiation properties,ensuring the integrity and authenticity of the signature’s source and content.In contrast,deniable signatures offer repudiation properties,allowing individual members within a circle to confirm or disclaim their association with the signature without relying on a trusted third party.This article presented a periodically deniable ring signature scheme based on SM2,extending the work of BAO Zijian et al.,to advance the use of domestic cryptographic algorithms.The scheme supported periodic confirmation and revocation of signatures,meeting the substantial demand for privacy protection.The formal proof provided demonstrates the scheme’s correctness,non-forgeability,anonymity,traceability,and non-repudiation properties.