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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。
Forward-secure cryptosystem can effectively reduce the impact of key compromise on security. By using the method proposed by Liu Yali et al. [2], this paper analyzes the strong forward-proxy proxy signature scheme proposed by Zhang et al. [1], and points out that this scheme neither satisfies the backward security nor satisfies the former To safety. Based on the above analysis results, Zhang scheme is improved and a forward-secure proxy signature scheme is designed. Security analysis shows that the improved scheme is a true forward-proxy proxy signature scheme.