两个前向安全代理盲签名方案的分析与改进

摘要

通过对周萍等提出的两种具有前向安全性质的代理盲签名方案的安全性进行分析，指出两种方案都不能抵抗原始签名人的伪造攻击，不具备前向安全性。针对以上问题，对原来两个方案分别进行了改进，改进后的两个方案具有抗伪造性和真正意义上的前向安全性，而且改进方案2还具有后向安全性，是一个强前向安全签名方案。%Through the security analysis of two forward secure proxy blind signature schemes proposed by Zhou Ping et .al ,it is pointed out that the two schemes don't resist the original signer's forgery attack ,and they have not the character‐istic of forward security at all .To solve the above problems ,two improved schemes are presented .The analysis results show that they have the features of resisting forging attack and true forward security ,especially ,the improved signature 2 has the property of backward security ,which is a strong forward secure signature .