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| 一个群签名成员删除方案的密码学分析 |
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黄振杰1,2, 林宣治1
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1.漳州师范学院,数学与信息科学系,福建,漳州,363000;2.西安电子科技大学,综合业务网国家重点实验室,陕西,西安,710071
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| 摘要: |
| 分析了王尚平等人提出的群签名成员删除方案,给出在群管理员更换群密钥后,已被删除成员更新其特性密钥、证明其成员资格和产生有效签名的方法,说明该方案是不安全的,不能真正删除群成员. |
| 关键词: 数字签名 群签名 成员删除 密码学分析 匿名性 |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant No.19931010 (国家自然科学基金); the National Grand Fundamental Research 973 Program of China under Grant No.G1999035804 (国家重点基础研究发展规划(973)) |
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| Cryptanalysis of a Member Deletion Scheme for Group Signature |
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HUANG Zhen-Jie,LIN Xuan-Zhi
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| Abstract: |
| This paper analyses Wang et al.’s member deletion scheme of group signature and shows that in their scheme, after the group manager changes the group’s key, the excluded group members can still modify their secret property key, prove their membership and issue valid signatures. So this scheme cannot delete any group member and is insecure. |
| Key words: digital signature group signature member deletion cryptanalysis anonymity |
