基于无证书密码体制的失败-停止环签名方案

Fail-Stop Ring Signature Scheme Based on Certificateless Cryptosystem

失败-停止群签名方案可抵抗强计算能力的敌手伪造签名,实现用户隐私信息的有效保护。为此,在失败-停止群签名方案的基础上,设计一种基于无证书密码体制的失败-停止环签名方案,使其同时具备强匿名性、可自主选择关联性和失败-停止特性,并且在随机预言模型下证明其满足自适应性选择消息攻击下的不可伪造性。性能分析结果表明,与同类环签名方案相比,该方案的密钥管理安全性更高且计算开销更小。

Fail-stop group signature schemes can prevent opponents with strong compute power from counterfeiting signatures,and thereby implement privacy protection for users.On the basis of the fail-stop group signature scheme,this paper designs a fail-stop ring signature scheme using certificateless cryptosystem.In the scheme,the signature simultaneously combines strong anonymity and optional relevance with the fail-stop feature.Also,under the random oracle model,the scheme satisfies Existential UnForgeability against adaptive Chosen-Message Attacks(EUF-CMA).Performance analysis results show that the proposed scheme has less computational overhead and stronger security of key management than the existing ring signature schemes.