Cryptanalysis of improved group signature scheme

Computer Engineering and Applications ›› 2007, Vol. 43 ›› Issue (33): 22-23.

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Cryptanalysis of improved group signature scheme

LU Rong-bo¹,WANG Chang-ji²,HE Da-ke³

1.College of Math. and Computer Science,Jishou University,Jishou,Hunan 416000,China
2.Dept. of Computer Science,Sun Yat-Sen University,Guangzhou 510275,China
3.Laboratory of Information Security and National Computing Gird,Southwest Jiaotong University,Chengdu 610031,China

Received:1900-01-01 Revised:1900-01-01 Online:2007-11-21 Published:2007-11-21
Contact: LU Rong-bo

对一种改进的群签名方案的密码学分析

鲁荣波¹,王常吉²,何大可³

1．吉首大学数学与计算机科学学院,湖南吉首 416000
2．中山大学计算机科学系,广州 510275
3．西南交通大学信息安全与国家计算网格实验室,成都 610031

通讯作者: 鲁荣波

Abstract

Abstract: An improved group signature scheme proposed by G.D.Si et al has been analyzed.We have showed that the scheme is insecure.The revocation center cannot open a valid group signature,so the group signature is not tracked.Meanwhile,the group manager can forge group signatures that could be verified by a verifier.And the scheme does not satisfy the properties of against coalition attack.Two group members can conspire to generate valid group signatures.

Key words: group signature, security analysis, forge attack, coalition attack

摘要： 对司光东等人提出的一种改进的群签名方案进行安全性分析,指出该方案是不安全的：群管理员不能够打开一个群签名,该群签名是不可跟踪的;群管理员可以伪造一个能通过验证的群签名;同时该方案并不能抵抗联合攻击,两个群成员合谋后可以伪造出有效的群签名。

关键词: 群签名, 安全性分析, 伪造攻击, 联合攻击

LU Rong-bo¹,WANG Chang-ji²,HE Da-ke³. Cryptanalysis of improved group signature scheme[J]. Computer Engineering and Applications, 2007, 43(33): 22-23.

鲁荣波¹,王常吉²,何大可³. 对一种改进的群签名方案的密码学分析[J]. 计算机工程与应用, 2007, 43(33): 22-23.

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Cryptanalysis of improved group signature scheme

对一种改进的群签名方案的密码学分析

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