基于身份的签密和代理签密方案

Identity Based Signcryption and Proxy Signcryption Schemes

首先给出一个基于身份的签密方案。在此基础上,提出基于身份的代理签密方案,并对两个新方案的安全性和效率进行分析。结果表明,该基于身份签密方案和基于身份代理签密方案的保密性在BDH假设下是语义安全,即IND-IBSC-CCA2安全的。在CDH假设下,方案是适应性选择消息和身份攻击下存在性不可伪造的。

An identity based signcryption scheme is proposed.Another identity based proxy signcryption scheme is given based on signcryption scheme.The security and efficiency of the schemes is analyzed as well.The two schemes satisfy the semantic security notion IND-IBSC-CCA2 under the Bilinear Diffie-Hellman assumption.The unforgeability against adaptive chosen message and identity attack derives under the Computational Diffie-Hellman assumption.