两种环签名方案的安全性分析及其改进
doi: 10.3724/SP.J.1146.2005.00574
Cryptanalysis and Improvement of Two Ring Signature Schemes
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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-changing attack)，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-signature existential forgery)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。Abstract: The security of the two ring signature schemes proposed by Xu(2004) and Zhang(2004) is analyzed, and its found that both the ring signature schemes are susceptible to group-changing attack. In addition, Zhangs 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).
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