基于RSA的群签名方案的缺陷及改进方案  

Flaw and improved scheme of group signature scheme based on RSA

作　　者：姜燕[1] 

机构地区：[1]山东轻工业学院现代教育技术中心

出　　处：《计算机工程与设计》2008年第7期1655-1657,1671,共4页Computer Engineering and Design

摘　　要：群签名作为一种特殊的数字签名因其显著的特性自被提出以来倍受关注,但是诸多群签名方案普遍存在无法实现前向安全、无法实现动态增删成员等问题。就一个基于RSA的群签名方案[9]阐述它的安全缺陷,证明了此缺陷会导致整个系统的崩溃,并给出改进方案。改进后的方案仍采用了原方案的公钥状态列表PKSL公布各成员公钥状态和时戳机构签名的方法,在只增加2个乘幂运算和1个乘法运算的基础上,实现了高效安全地增加或删除群成员,并具备前向安全特性。Group signature has been positive regarded for its salient features since it is introduced as a special digital signature, however, forward security and dynamic member joining or deleting is not achieved yet in these schemes. A security flaw of a group signature scheme based on RSA signature scheme is described. And an improved scheme is proposed. The improved scheme is secure, forward and dynamic.

关 键 词：群签名 前向安全 共模攻击 公钥状态列表 动态群签名 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]