一个基于身份的签密方案的分析与改进  

Analysis and improvement of ID-based signcryption scheme

作　　者：何俊杰[1] 焦淑云[1] 祁传达[1] 

机构地区：[1]信阳师范学院数学与信息科学学院,河南信阳464000

出　　处：《计算机应用研究》2013年第3期913-916,920,共5页Application Research of Computers

基　　金：国家自然科学基金资助项目(61272465);河南省自然科学基金资助项目(102102210242;122400450189);河南省教育厅科学技术研究重点项目(12A520034)

摘　　要：对肖鸿飞等人提出的基于身份的改进高效签密方案进行分析,指出方案不能抵抗不可区分性选择明文攻击和不诚实接收者的一般性伪造攻击。为此,提出了一个改进的签密方案。运用随机预言机模型,证明了新方案在适应性选择密文攻击下是不可区分的和在适应性选择消息及身份攻击下是存在性不可伪造的,安全性可以分别规约为判定双线性Diffie-Hellman问题和计算Diffie-Hellman问题。Cryptanalysis of the improved efficient ID-based signcryption scheme which was proposed by Xiao,et al. shows that the scheme can＇ t resist indistinguishability under chosen ciphertext attack and dishonest recipient＇ s general forgery attack. This paper proposed an improved signcryption scheme to overcome these security problems. The new scheme had the indistin- guishability against adaptive chosen ciphertext attacks property and was secure against an existential forgery for adaptive chosen messages and identity attacks in random oracle model, and the security was reduced to decisional bilinear Diffie-Hellman prob- lem and computational Diffie-Hellman problem.

关 键 词：签密 基于身份 公开验证性 前向安全性 语义安全性 不可伪造性 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]