在标准模型下安全的基于身份的代理签名方案  

Identity-Based Proxy Signature Scheme Secure in Standard Model

作　　者：李明祥[1] 韩伯涛[1] 朱建勇[2] 郑雪峰[1] 闫鹏[2] 

机构地区：[1]北京科技大学信息工程学院,北京100083 [2]国家信息中心,北京100045

出　　处：《华南理工大学学报（自然科学版）》2009年第5期118-122,129,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家“863”计划项目(2006AA01Z455);国家自然科学基金资助项目(60673160)

摘　　要：为了解决现有基于身份的代理签名方案在随机预言模型下安全而在现实环境中不一定安全的问题,文中首先定义了基于身份的代理签名的安全模型,然后设计了一种新的基于身份的代理签名方案,最后在所定义的安全模型下基于计算D iffie-Hellman假设不使用随机预言证明了方案的安全性.文中方案仅比最近提出的一种高效的基于身份的代理签名方案多一次双线性映射运算.The existing identity-based proxy signature schemes are secure in the random oracle model but not al- ways secure in the real world. In order to solve this problem, a security model of identity-based proxy signature schemes is presented, and a new identity-based proxy signature scheme is proposed. The security of the proposed scheme is then proved based on the computational Diffie-Hellman assumption without using the random oracle heu- ristic in the presented security model. The results indicate that, as compared with the efficient identity-based proxy signature scheme recently presented, the proposed scheme only needs an additional bilinear mapping.

关 键 词：签名 代理 随机预言模型 双线性映射 计算Diffie—Hellman假设 

分 类 号：TN918.1[电子电信—通信与信息系统]