计算机工程与应用 ›› 2011, Vol. 47 ›› Issue (29): 93-95.

• 网络、通信、安全 • 上一篇    下一篇

无可信中心的门限签名方案的分析和改进

王 鑫,张少武   

  1. 信息工程大学 电子技术学院,郑州 450004

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-10-11 发布日期:2011-10-11

Analysis and improvement of threshold signature scheme without trusted party

WANG Xin,ZHANG Shaowu   

  1. Institute of Electronic Technology,PLA Information Engineering University,Zhengzhou 450004,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-10-11 Published:2011-10-11

摘要: 分析了Wang门限签名方案,归纳总结了方案中的安全缺陷,指出根本原因是成员私钥在签名过程中被割裂后退化使用。提出了一个改进方案,解决了原方案中的私钥退化问题,使其安全性大大提高。证明新方案能够抗伪造攻击和合谋攻击,并具有匿名性和可追查性。

关键词: 数字签名, 门限签名, 私钥退化

Abstract: The security weaknesses of the threshold signature scheme without a trusted party worked out by Wang Bin and Li Jianhua are summed up.The radical reason is that the private key is dissevered and degenerately used in the signature process.As a result,an improved scheme is proposed which avoids the weaknesses and improves the security.It is proved that the proposed scheme can resist conspiracy attacks and forgery attacks and can provide anonymity and traceability at the same time.

Key words: digital signature, threshold signature, key degeneration