代理盲签名和多重代理盲签名的安全性分析

Security Analysis of Proxy Blind Signature and Multi-proxy Blind Signature

王国瞻等人(计算机工程,2010年第3期和第8期)分别对谷利泽等人提出的代理盲签名方案和Lu等人提出的多重代理盲签名方案进行攻击,指出这2个方案不满足盲性。针对王国瞻等人对谷利泽等人和Lu等人方案的可追踪性攻击问题,指出王国瞻等人的攻击是无效的,并采用构造方法证明代理签名人不能根据已有的信息追踪到签名。分析结果证明,王国瞻等人的攻击无效,谷利泽等人的方案和Lu等人的方案仍然满足盲性,是不可追踪的。

Wang Guozhan et al.（Computer Engineering,2010,No.3 and No.8） attacks a proxy blind signature scheme proposed by Gu Lize et al.and a multi-proxy blind signature scheme proposed by Lu et al.respectively,and points out that the two schemes do not satisfy the property of blindness.Aiming at Wang et al.’s attack to the scheme of Gu Lize et al and the scheme of Lu et al.,this paper points out that Wang Guozhan et al.’s attack is not valid,and uses the method of construction to prove that the proxy signer can not use gained information to track signature.Analysis result shows that both of Gu Lize et al.’s scheme and Lu et al.’s scheme still satisfy the property of blindness and they are unlinkable.