Wang门限签名方案的分析和改进

Wang门限签名方案的分析和改进

李国文，李如鹏，王　进，李大兴

山东大学网络信息安全研究所，山东济南250100

收稿日期:2006-05-02 修回日期:1900-01-01 出版日期:2006-10-24 发布日期:2006-10-24
通讯作者: 李国文

Analysis and improvement of Wang threshold signature scheme

LI Guo-wei,LI Ru-peng and LI Da-xing

Institute of Network Security, Shandong Univ., Jinan 250100, Shandong, China

Received:2006-05-02 Revised:1900-01-01 Online:2006-10-24 Published:2006-10-24
Contact: LI Guo-wei

摘要/Abstract

摘要： 在分析Wang门限签名方案的安全性的基础上，指出了该方案中真正起作用的只是私钥的一部分．提出了一个简化方案，证明了简化方案的安全性等价于修正后的Wang方案．由于采用的基本签名方案不适合门限签名，两个方案都易受内部伪造攻击，对此给出了解决办法．

关键词: 门限签名, 离散对数问题, 门限多签名 , Lagrange插值

Abstract: Based on security analysis of Wang's threshold signature scheme, it is pointed out that only the partial private key is valid in the scheme. A simplified scheme is proposed, of which the security is equal to the one of the rectified Wang's scheme. Both schemes are vulnerable to universal forgery by an insider attacker because their underlying signature schemes are unfit for threshold signature. Then a solution is given for this problem.

Key words: threshold multisignature , Lagrange interpolation, discrete logarithm problem, threshold signature

中图分类号:

TP309

李国文,李如鹏,王　进,李大兴 . Wang门限签名方案的分析和改进[J]. J4, 2007, 42(1): 55-58 .

LI Guo-wei,LI Ru-peng and LI Da-xing . Analysis and improvement of Wang threshold signature scheme[J]. J4, 2007, 42(1): 55-58 .

参考文献

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