关键词: 群签名, 中国剩余定理, 安全性

Abstract: Analysis of a group signature scheme based on Chinese remainder theorem, shows that the scheme is insecure：any member of a group or a group member has been revoked can completely break the scheme. Aiming at these flaws, this paper puts forward an improved scheme. Analysis results show that new scheme can effectively add or delete group members while keeping secret keys of other members unchanged. Moreover, the new scheme has many properties, such as unforgeability, exculpability and coalition-resistant.

Key words: group signature, Chinese remainder theorem, security