几个门限群签名方案的弱点

Weaknesses of Some Threshold Group Signature Schemes

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 .

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.