一种面向授权子集分布式群签名方案  

Distributed group signature scheme for authorized subsets

作　　者：王明文[1] 郑伟范[1] 

机构地区：[1]西南交通大学信息化研究院,成都610031

出　　处：《计算机应用研究》2009年第12期4761-4763,共3页Application Research of Computers

基　　金：西南交通大学青年教师科研起步项目(2008Q099)

摘　　要：为了克服门限签名方案应用的局限性,结合矢量空间秘密共享方案和RSA数字签名方案,提出了一个针对小授权子集数的轻量级分布式群数字签名方案。不同于门限数字签名方案,对于具有N个成员且授权子集数小于N的群组,群组的任意授权子集都能够代表群组产生签名,而非授权子集不能代表群组产生签名。签名合成者可以容易地验证群组成员提交的个体签名的合法性,并且群组签名的合法性也可以容易的得到验证。通过对方案的安全分析表明,攻击者无法破解系统秘密,因此既不能伪造个体签名也不能伪造群组签名,并且恶意群组成员也无法阻止诚实的授权子集生成有效的群组签名。In order to overcome the limitations of the threshold signature scheme, this paper proposed a distributed group signature scheme for small number of authorized subsets in a group by combining a vector space secret sharing scheme and RSA digital signature scheme. For a group with N members and less than N authorized subsets, unlike threshold signature schemes, arbitrary authorized subsets could sign message on behalf of the group, while any other subsets could not sign message on behalf of the group. The individual signature combiner could easily verify the individual signatures issued by the group members, and the validity of the group signature could also be checked easily. On the security analysis of the scheme, the adversary has no means to acquire the system secret, hence he can forge neither the individual signatures nor the group signature. Even malicious group members cannot prevent the members from the honest authorized subsets to generate the valid group signatures.

关 键 词：数字签名 群签名 秘密共享 分布式方案 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]