一个动态群签名的实用性分析

摘要

According to zero-knowledge proof, combined with the nature of polynomials some people proposed a dynamic group signature scheme, and the scheme is secure.Dynamic group signature is studied and several problem is discovered in their project:① It is danger that member in the group can be framed by administrator if the project successful operation;② The knowledge signature used in that project can not validate some message; ③ There are some redundance data in their signature;④ Some problem found in remove method.So this project is believed that not practical.%杨等人根据零知识证明,结合多项式的性质提出了一种动态群签名方案,并且证明该方案具有安全性.研究了杨等人的动态群签名方案,发现该方案存有以下问题:① 在方案可行的情况下该方案存在成员能被管理员陷害的危险;②方案中用到的知识签名并不能正确验证出群成员知道某种秘密值;③签名中存在冗余的数据;④ 方案中的成员删除方法存在问题.由此得出结论该方案不具有实用性.