【摘要】 门限群签名是群签名中重要的一类,它是秘钥共享与群签名的有机结合.本文通过文献[5]中的MSP方案(Monotone Span Program),提出了一种新的门限群签名方案.在本签名方案建立后.只有达到门限的群成员的联合才能生成一个有效的群签名.并且可以方便的加入或删除成员.一旦发生争议.只有群管理员才能确定签名人的身份.该方案能够抵抗合谋攻击:即群中任意一组成员合谋都无法恢复群秘钥k.本方案的安全性基于Gap Diffie-Hellman群上的计算Diffie-Hellman问题难解上.因此在计算上是安全的.更多还原

【Abstract】 In this paper,a new(t,n)threshold group signature scheme is proposed based on Montone Span Programs.When the scheme is built,a set of members whose number is over the threshold can make a valid group signature.When the dispute occupys,only the authority can determine who is the real signer.The scheme can withstand conspiracy attacks.The security of tiffs scheme is based on the harness of the computational Diffie-Hellman(CDH)problems.Therefore,the schemes is secure for calculation.更多还原