可转换签密的几种改进方案  

Improved convertible signcryption schemes

作　　者：彭长根[1] 李祥[1] 罗文俊[1] 

机构地区：[1]贵州大学计算机软件与理论研究所

出　　处：《计算机应用》2006年第5期1068-1070,1074,共4页journal of Computer Applications

基　　金：贵州省自然科学基金资助项目(20052107);贵州省省长基金资助项目(2005368)

摘　　要：基于椭圆曲线密码体制建立了几个具有语义安全的可转换签密方案。这些方案都实现了当签密者抵赖其签密时,接收者可将签密转换成普通签名以向第三方证明签密者的欺骗;解决了Huang、Chang的方案(简称HC方案)和Wang、Bao等人的方案(简称WB方案)不满足语义安全的弱点,以及HC方案不能抵抗已知明文攻击的缺陷。相对目前的一些方案,本文方案具有更小的通信代价和计算代价。Several convertible signcryption schemes with semantic security based on elliptic curve cryptosystem were proposed. In these schemes, if the signer denies her signcryption, the receiver could prove the dishonesty of the sender to any third party by converting the signcryption into an ordinary signature. These schemes have improved the weaknesses that the semantic security of the message couldn＇t be provided in H-C scheme （ Huang eta/. ＇s scheme） and W-B scheme （ Wang et al. ＇s scheme） and the session key was easily divulged in H-C scheme. Compared with current schemes, our schemes have lower communication cost and computational cost.

关 键 词：签密 认证加密 可转换 语义安全 椭圆曲线密码体制 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]