摘要
在实际应用中,前向安全性和公开验证性对密码系统来说是非常重要的。分析了不使用Hash和Redundancy函数的签密方案的前向安全性和公开验证性,分析表明该方案不具备前向安全性和公开验证性。分别就其前向安全性和公开验证性提出了相应的改进方案,并对方案进行了理论上的证明。改进方案克服了原方案中不具备前向安全性或公开验证性的缺陷;而且从效率上来分析,并没有明显增加计算量或传输量。
In practical applications, the forward security and public verifiability are very important to cryptography. An authenticated signcryption without using Hash and Redundancy functions is analyzed in this paper, and the result indicates that the scheme does not possess the characters of forward security and public verifiability. Modified schemes are proposed respectively according to each character mentioned above, and theoretically proved. By adop- ting the modified schemes, the original scheme's defects of non - forward - security or non - public - verifiability are overcome, and the computational cost and communication overhead are not increased.
出处
《空军工程大学学报(自然科学版)》
CSCD
北大核心
2010年第1期91-94,共4页
Journal of Air Force Engineering University(Natural Science Edition)
基金
国家自然科学基金资助项目(60873233)
陕西省工业科技攻关基金资助项目(2008-k04-21)
西安市产学研合作基金资助项目(CXY08016)
中国博士后科学基金资助项目(20080440550)