摘要： 研究一种有代理的门限签名方案，该方案由于群私钥分享阶段设置不当，使其不满足强不可伪造性。为此，提出一种改进方案。在群私钥分享阶段加入哈希函数运算，并在签名时改变部分签名的形式使其能够抵抗外部攻击和内部攻击。分析结果表明，改进后的方案是安全的。

关键词: 代理签名, 有代理的门限签名, 强不可伪造性, 伪造攻击

Abstract: This paper presents a security analysis of a threshold signature scheme with proxy. It finds that the scheme can not meet the strong unforgeability because of the group private-key setting incorrectly. To overcome the original scheme’s weaknesses, this paper proposes an improved scheme. The new scheme can resist internal attack and external attack by increasing the application of the hash function in the group private-key setting and changing the part of signature form. The security analysis proves that the improvement scheme is secure.

Key words: proxy signature, threshold signature with proxy, strong unforgeability, forgery attack

中图分类号: 

• TP309