一个无可信中心的门限群签名方案  

Threshold Group Signature Scheme Without TA

作　　者：尚光龙[1] 曾雪松[1] SHANG Guang long;ZENG Xue song(School of Mathematics and Computer Science,Xinyang Vocational Technical College,Xinyang,Henan 464000,China)

机构地区：[1]信阳职业技术学院数学与计算机科学学院,河南信阳464000

出　　处：《河北北方学院学报（自然科学版）》2017年第5期4-8,共5页Journal of Hebei North University:Natural Science Edition

基　　金：河南省科技厅重点科技攻关项目(142102210331)

摘　　要：目的传统门限群签名方案一般都依赖于可信中心生成基本参数,然而,现实中的可信中心不一定是完全可信的。为提高门限签名的安全性,对无可信中心的门限群签名进行安全机制探讨。方法在没有可信中心的前提下,基于分布式的RSA秘钥产生协议,生成RSA密码体制相关参数。根据门限群签名机制,签名群中参与签名成员生成部门签名,并通过组合部分签名生成门限群签名,签名验证者验证群签名的有效性。对签名方案的安全性和运算量进行分析,论证方案的安全性。结果通过分布式秘钥产生协议生成的RSA密码参数能够安全实现门限群签名,该签名完全有效并具备较高的安全性,签名机制能够抵御抗合谋攻击和伪造签名攻击,符合门限群签名的安全性要求。结论分析论证表明,基于分布式秘钥生成协议和Shamir门限机制提出的无可信中心的门限群签名方案,克服了传统门限群签名过于依赖可信中心的弊端,提高了门限群签名的安全性,是一个符合门限机制、安全性增强的群签名方案,具有一定的理论和应用价值。ObjectiveIn a general way,the threshold group signature scheme depends the TA to generate the parameters.However,the TA is not necessarily to be fully trusted in reality.To increase the security of threshold signature,the security mechanism of threshold group signature without the trusted center is discussed.MethodsWithout the trusted center,the distributed protocol is based on to generate the RSA keys.Under this mechanism,each participant completes the part signature and the signature by combining the part signature and the signature verifier to verify the validity of the group signature.At last,the computational complexity of the scheme is analyzed and the security of the scheme is demonstrated.ResultsAnalysis shows that this scheme can implement threshold group signature and the signature is fully effective with high security;this signature scheme can resist collusion attack and forgery signature attack,and meet the security requirements of threshold group signature.ConclusionThe analysis shows that the scheme overcomes the traditional disadvantages of the traditional threshold group signature which is too dependent on the TA,and improves the security of threshold group signature.So,it is a safe and feasible threshold group signature scheme,which has certain theoretical and practical value.

关 键 词：可信中心 门限机制 群签名 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]