摘要
通过对Xu(2004)和Zhang(2004)提出的两种环签名方案进行分析,指出了这两种环签名方案都容易受到群成员改变攻击(group-changingattack),并给出了攻击方法;另外,Zhang的方案还容易受到多已知签名存在伪造(multiple-known-signatureexistentialforgery)攻击。为防范这两种攻击,对这两种环签名方案进行了改进,改进后的方案在最强的安全模型(Joseph,2004提出)中仍是安全的。
The security of the two ring signature schemes proposed by Xu(2004) and Zhaag(2004) is analyzed, and it's found that both the ring signature schemes are susceptible to group-changing attack. In addition, Zhang's scheme can easily be attacked by multiple-known-signature existential forgery. To guard against the two attacks, the two ring signature schemes are improved, which can make the improved schemes is still secure even in the strongest security model (proposed by Joseph in 2004).
出处
《电子与信息学报》
EI
CSCD
北大核心
2007年第1期201-204,共4页
Journal of Electronics & Information Technology
基金
国家自然科学基金重点项目(60432040)资助课题