一种前向安全的ACJT群签名方案

ACJT group signature scheme with forward security.

提出了一种前向安全的ACJT群签名方案,在ACJT群签名方案的基础上,增加了前向安全性和成员撤消的功能。前向安全性通过一个进化参数实现,进化参数随着时间段的变化而进化更新,从而使群公钥和成员证书进化更新,即使成员密钥泄露,攻击者也无法伪造该成员以前的签名;成员撤消通过证书状态列表(CSL)实现,只需群中心实时更新成员证书状态列表,被撤消成员其以前的签名仍然有效。该方案的安全性和效率都非常高。

An ACJT group signature scheme with forward security is proposed in this paper.Based on the ACJT group signature scheme,forward security and revocation are improved.Forward security is achieved by an evolutional parameter,which is updated with the evolution of time segment,and the group public key and members＇ certificates are updated along with the parameter.If a menber＇s private key is betrayed,the attackers can＇t forge the member＇s previous signatures.Revocation is achieved by Certificate State List （CSL）,which needs the group center to update the CSL in real time,and the previous signatures of the revocative members are still valid.The new scheme is highly secure and efficient.