一种高效的动态群签名方案

An Efficient Dynamic Group Signature Scheme

在群签名系统中如何有效删除成员是一个重要的研究课题,王尚平提出的成员删除方案虽然高效,但已被证明不能达到真正删除成员的目的。新方案基于王尚平等人的群签名成员删除方案原理,利用中国剩余定理对不同合法成员的特性密钥更新算子进行不同的加密处理,从而达到真正删除成员的目的。基于强RSA假设和大整数分解的困难性,新方案具有较高的安全性。

In a group signature system, the efficient deletion of certain member is an important research topic. An efficient member deletion scheme proposed by WANG Shang-ping is effective, however, is also proved that it could not really delete group members. Based on the principle of WANG＇s deletion scheme, an improved scheme with Chinese Remainder Theorem is proposed, which makes sure that legitimate members＇ renewed operators of secret property keys are different from each other. In this way, the deletion could be really achieved. The improved scheme, based on the difficulty of strong RSA assumption and large integers decomposition, is of much higher security.