| 摘要: |
| 门限群签名是一类重要的数字签名,但现有的门限群签名方案几乎都有缺点.首先给出良好的 门限群签名所应具备的性质,随后详细分析了3个门限群签名方案的弱点.其中最主要的弱点 是:部分成员可以合谋得到系统的秘密参数,从而伪造群签名,甚至彻底攻破签名系统. |
| 关键词: 数字签名,群签名,门限群签名,密码学. |
| DOI： |
| 分类号: |
| 基金项目:本文研究得到国家自然科学基金(No.19931010)和国家重点基础研究发展规划项目(N o.G199035810)资助. |
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| Weaknesses of Some Threshold Group Signature Schemes |
|
WANG Gui-lin,QING Si-han
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| Abstract: |
| Threshold group signature is an important kind of signatures, but all of the exi sting threshold group schemes have weaknesses. Several properties are proposed t o define a good threshold group scheme. Then, the weaknesses of three threshold group schemes are analyzed. The most serious weakness is that part of members ca n conspire to get system secret parameters and then forge a valid signature. In the worst situation, the total system is broken. |
| Key words: Digital signature, group signature, threshold group signature, cryptography. |
