一个具有消息恢复的指定验证者的代理盲签名方案

A Proxy Blind Signature Schemes of Designated Verifier with Message Recovery

针对最近提出的若干具有消息恢复的指定验证者的盲签名方案,提出对这些方案的安全性分析。分析显示,这些方案都是不安全的,均不满足不可伪造性,攻击者能任意伪造签名。因此,这些方案都不能应用到如电子投票、电子货币等实际系统中。为了克服这些缺陷,提出了一个改进的具有消息恢复的代理盲签名方案,并对方案的安全性和有效性进行了分析。分析显示,提出的方案不仅安全而且有效。

The security of two blind signature schemes designated verifier with message recovery proposed recently is analyzed. The analysis shows that both schemes are not secure and do not satisfy the property of unforgeability, allowing an attacker to forge on any message. Both schemes can not be applied to real systems such as electronic voting and electronic cash. In order to overcome this drawback, an improved proxy blind signature scheme with message recovery is proposed, and the security and efficiency of the scheme is analyzed. The analysis shows that the proposed scheme is both secure and efficient.