一种前向安全的动态子群签名方案

子群签名方案是普通群签名方案的一种推广,如何构造安全、高效的子群签名方案到目前为止还是一个未解决的问题。论文提出了一种前向安全的动态子群签名方案,它具有前向安全性及子群签名所要求的组成完整性、子群签名不可链接性等较为全面的安全性能;效率方面,由于中国剩余定理的引入,论文方案没有采用知识签名,相对以前提出的子群签名方案,具有更高的效率;并且在不改变有效成员的密钥情况下,可以安全地增加删除群成员;群成员撤消时,群公钥长度不变;给出了较为充分的安全性分析和执行效率比较,并对以上结论进行证明。

A Dynamic Sub-Group Signature Scheme with Forward Security

In the previous sub-group signature schemes,the property of safety and efficiency have not been achieved at the same time.A forward secure and dynamic sub-group signature scheme is proposed in this paper.The forward security,compositional integrity,unlinkability of sub-group signature and some other safety properties are achieved at the same time.The scheme is bulding without signture of knowledge,so it is more efficient than the previous schemes.In the scheme,the group manager can safely add or delete members while keeping the secret keys of the other members unchanned.Goup center’s public keys are unchanned during the revocation.The security of the new scheme is analyzed sufficiently in the random oracle.And the efficiency of the new schemes is compared with the previous schemes using specific parameters.