Computer Engineering and Applications ›› 2010, Vol. 46 ›› Issue (31): 95-97.DOI: 10.3778/j.issn.1002-8331.2010.31.026

• 网络、通信、安全 • Previous Articles     Next Articles

Cryptanalysis and improvement of threshold proxy signature scheme

SUN Mei,WEI Shi-min,ZHAO Bing   

  • Received:2010-06-22 Revised:2010-08-23 Online:2010-11-01 Published:2010-11-01
  • Contact: SUN Mei


孙 梅,魏仕民,赵 兵   

  • 通讯作者: 孙 梅

Abstract: Present a security analysis of the Xu-zhang-feng identity based threshold proxy signature scheme,which can not resist original singer changing attack,at the same time,this scheme can’t withstand conspiracy attack,any [t](or more) proxy signers can conspire to gain the private keys of other [n-t] proxy signers,and can forge their valid signature.An improved threshold proxy signature scheme is proposed,which can resolve the security problem existing in the Xu-zhang-feng identity based proxy threshold signature scheme.

Key words: threshold proxy signature, identity based, original signer changing attack

摘要: 通过对Xu-zhang-feng的基于身份的门限代理签名方案分析,发现该方案不能抵抗原始签名人的改变攻击,同时该方案也不能抵御合谋攻击,任意不少于t个代理人都可以合谋获得其他n-t个代理人的私钥从而伪造他们的签名。在此基础上提出了改进的基于身份的门限代理方案,克服了原方案的缺陷。

关键词: 门限代理签名, 基于身份, 原始签名人改变攻击

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