一种子秘密演化的群体代理签名方案

针对目前群体代理签名方案中授权代理信息共享方法单一的问题,提出一种子秘密演化的群体代理签名方案.该方案在依赖于CDH问题的困难性以及双线性映射的基础上,运用细胞自动机理论和多项式共享方法构建出授权代理信息双子秘密,从而使得共享秘密能够随着代理签名次数进行演化更新,提高了授权代理信息的安全性.并且对方案的正确性、安全性和效率进行了分析.该方案无可信任中心,效率更高,不仅在群体代理签名可证安全模型下被证明具有群体代理签名不可伪造性,而且能够追踪代理者合谋滥用代理签名的情况.与现有的群体代理签名方案相比,该方案具有更高的安全性.

A Group Proxy Signature Scheme Based on Sub-Secret Evolution

Few sharing methods of delegating information are used in current group proxy signature schemes.A new secure group proxy signature scheme based on sub-secret evolution is proposed in this paper,which is based on CDHP and bilinear pairings.In this scheme,double sub-secret of delegating information is constructed by secret sharing method and cellular automata theory so that sharing secrets can be evolved with the number of proxy signatures.And the correctness,the security and the efficiency of the scheme are analyzed.The scheme is more efficient without trust center,and is proved to have the existential group proxy signature unforgeability under the provable security model of group proxy signature and to be able to can trace proxies abusing proxy signature.Compared with other group proxy signature schemes,this scheme is more secure.