摘要
文献[8]在CS97群签名方案的基础上,利用更新算子的思想,提出了一个“群数字签名中成员删除问题的更新算子方案”,在该方案中,被删除的群成员仍然可以做出签名,并且可以被验证者验证,只有群打开签名才能发现签名者的不合法身份。本文基于此方案给出一个安全的改进方案。
In the paper “A new solution scheme for the member deletion problem in group signature by use of renew operator”, Wang Shangping and Wang Yumin give a new method to solve the problem in 2003. In their solution, a new method of so-called “renew operator”is used. But we point out that in their scheme, the member who had been deleted from the group can still give out a group signature that can pass the verification successfully. Only when the group manager opens the signature can the signer＇s illegitimate identity be uncovered. And what is more, we give an improved group signature scheme basedupon the Wang-Wang scheme which can solve that problem.
出处
《信息工程大学学报》
2005年第3期32-35,共4页
Journal of Information Engineering University
基金
河南省杰出青年科学基金资助项目(0312001800)。
