【摘要】 前向安全的密码体制可以有效地降低密钥泄露对安全性的影响。利用刘亚丽等人提出的方法[2],对张波等人提出的强前向安全的代理签名方案(Zhang方案)[1]进行分析,指出该方案既不满足后向安全性,也不满足前向安全性。基于以上分析结果,对Zhang方案进行改进,设计出一个前向安全的代理签名方案,安全性分析表明,改进方案是一个真正前向安全的代理签名方案。更多还原

【Abstract】 The forward-secure cryptography can effectively reduce the impact of secret keys’ exposure on the security.Based on the method proposed by LIU etc.[2],we make a security analysis of the strong forward-secure proxy signature scheme(Zhang’s Scheme)[1],and find the scheme is neither backward-secure nor forward-secure.Then we make an improvement of Zhang’s Scheme and propose a forward-secure proxy signature scheme.The security analysis of the scheme shows that the proposed scheme is a truly forward-secure proxy signature scheme.更多还原