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针对陈伟东提出的一类存在特权集的门限群签名方案,最近有文献相继指出该类方案存在严重的安全问题,并针对其主要存在的不能抵御内部成员的合谋攻击,不能抵抗可信密钥认证中心发起的伪造攻击,签名不具有可追踪性等安全隐患提出了改进方案.本文结合他们的安全性分析和存在特权集的门限群签名方案,依据schnorr秘密分享原理,提出一种适用于多个特权集的门限群代理多重签名方案,实现了不同集合用户具有不同权限的代理授权和代理签名,增强了门限群代理签名方案的安全性和可靠性.并且着重对该方案进行了安全性分析,指出在离散对数假设的前提下,该方案是安全的.
Aiming at a class of threshold group signature schemes with privilege sets proposed by Chen Weidong, recently some literatures have pointed out that there are serious security problems in this class of schemes. In view of its main existence, it can not resist collusion attacks of internal members and can not resist Trusted Key Authentication The center initiates a counterfeit attack, the signature does not have the traceability and so on.This paper combines their security analysis and the privilege set threshold group signature scheme, according to the schnorr secret sharing principle, proposes a suitable multiple Which can enhance the security and reliability of the threshold group proxy signature scheme.And it focuses on the security analysis of the scheme, It is pointed out that the scheme is safe under the assumption of discrete logarithm.