一个群签名成员删除方案的密码学分析

Cryptanalysis of a Member Deletion Scheme for Group Signature

分析了王尚平等人提出的群签名成员删除方案,给出在群管理员更换群密钥后,已被删除成员更新其特性密钥、证明其成员资格和产生有效签名的方法,说明该方案是不安全的,不能真正删除群成员.

This paper analyses Wang et al.'s member deletion scheme of group signature and shows that in their scheme, after the group manager changes the group's key, the excluded group members can still modify their secret property key, prove their membership and issue valid signatures. So this scheme cannot delete any group member and is insecure.