针对谢琪关于一个群签名方案的密码学分析,证明其不相关性分析是不成立的;针对鲁荣波关于一个改进群签名方案的安全性分析,证明通过另外两种不同的方式,群管理员成功伪造有效群签名。
Aiming at Xie Qi’s cryptanalysis about a group signature scheme,this paper demonstrates it doesn’t come into existence about unlinkability.Aiming at Lu Rongbo’s cryptanalysis about an improved group signature scheme,it proves that its group manager forges valid signature by two kinds of different attack manners.