两个门限签名的密码分析

CRYPTANALYSIS OF TWO THRESHOLD SIGNATURE SCHEMES

为克服合谋攻击,文献[5,6]通过引入成员身份代码参数分别设计了一个门限签名方案。通过对这两个方案进行分析,针对其漏洞提出了一个伪造攻击方法。任何人对于任意消息都可用该攻击方式产生有效签名,从而说明其方案是不安全的。该伪造攻击的提出,为新的门限签名方案的设计提供了有效借鉴。

Two threshold signature schemes were designed respectively in literature [5,6],in which identity code parameters were intro-duced to overcome collusion attacks. In this paper,we present a forgery attack approach against their vulnerabilities after analysing these two schemes,the approach can be used by anyone to forge valid signature using any information,so that it demonstrates these two schemes are not secure. What we have done provides some references to the researchers on designing new threshold signature schemes.