基于离散对数多重签名体制的改进

A modification for multisignature schemes based on DLP

通过分析研究基于Meta-E1 Gamal方案的多重签名体制和基于Schnorr方案的多重签名体制,我们发现这些体制中存在多个签名者如果在生成自己的密钥时相互合作就能达到日后否认消息签名的攻击手段。据此我们对这些体制的密钥生成部分进行了改进,提出避免上述攻击新的多重签名体制。同时本文的方法在代理签名体制中也有应用。

We show a attack for purpose on most of which extend from signature schemes based on DLP . The attackers can deny that they had take part in process of signing some message with others . A modification is made for these schemes' key generations ,which can efficiently void this attack . And our idea can be applied to proxy signature schemes.