对陈少真等提出的一种有效取消的向前安全群签名方案进行了密码学分析,首先指出该群签名体制存在错误的模运算及冗余数据,效率不高。其次,指出该群签名体制是不安全的,群管理员可以伪造能够通过验证的群签名。
The efficient revocable group signature scheme with forward security proposed by Chen Shao-Zhen et al is analyzed.First,its shortage in the module and there is redundancy data in the scheme,so,it is low in efficiency.At the same time,it is insecure.The group manager can forge group signatures that can be verified by a verifier.