摘要： 门限数字签名是数字签名领域的重要研究内容。在第十届全国青年通信学术会议上，苗澎锋提出了一个有特殊成员的(t, n)门限签名方案，通过安全性分析，发现它是不安全的，容易受到3种伪造攻击。在保持原方案基本属性的基础上对其进行了改进。新方案可以克服3种伪造攻击，限制SDC的权限，保护签名人的利益，相对于原方案更安全有效。

关键词: 门限签名, 特殊成员, 伪造攻击

Abstract: Threshold signature is an important part of digital signature. Through the security analysis of a new(t, n) threshold signature scheme with a special member presented by Miao at the tenth youth communication conference, this paper proposes three kinds of forgery attacks, malicious SDC and the signaturer can forge a valid signature. An improved scheme based on the property of original scheme is proposed and the security weakness of Miao scheme is overcome. In the new scheme, the power of SDC is limited and the benefit of signaturer is protected, so it is more safety and efficient.

Key words: threshold signature, special member, forgery attack

中图分类号: 

• TN918