抗合谋攻击的门限签名方案分析与改进

Analysis and Improvement of Threshold Signature Scheme Resisting Conspiracy Attack

针对张有谊等人提出的能抗合谋攻击的门限签名方案(计算机应用与软件,2008年12期),给出一种伪造攻击方法,任何人都可以用该方法生成有效的门限签名,从而证明该方案是不安全的。针对其存在的缺陷,提出一个改进的门限签名方案,通过理论分析证明了改进方案的正确性和安全性。

This paper presents a forgery attack on the threshold signature scheme proposed by Zhang Youyi et al that can resist conspiracy attack.Everyone can generate a valid threshold signature,which proves the scheme is not secure.So an improved scheme is proposed to overcome the weakness of the signature scheme,and its validity and security are proved.