摘要
首次对标准模型下基于身份广义签密体制进行了研究。利用双线性对,提出了基于身份的广义签密方案,并在标准模型下证明了方案的安全性。结果表明,方案的保密性在DBDH假设下是适应性选择密文攻击下不可区分的,在CDHP假设下方案是适应性选择消息攻击下存在性不可伪造的。与其他两个基于身份广义签密方案相比,本方案效率较高,且是在标准模型下可证明是安全的。
This paper conducted a research on identity-based gengeralized signcryption under the standard model for the first time. It proposed an identity-based generalized signcryption scheme and gave its security proof in the standard model. It shows that the confidentiality satisfies the semantic security notion IND-CCA2 under the decisional bilinear Diffie-Hellman assumption and the unforgeability against adaptive chosen message attack derives under the computational Diffie-Hellman assumption. Compare with the two identity-based generalized signcryption schemes,the proposed one is comparably efficient and provably secure under standard model.
出处
《计算机应用研究》
CSCD
北大核心
2010年第10期3851-3854,3858,共5页
Application Research of Computers
基金
国家"863"计划资助项目(2009AA01Z417)
国家自然科学基金资助项目(90704003)
关键词
基于身份签密
广义签密
标准模型
双线性对
可证安全
identity-based signcryption
generalized signcryption
standard model
bilinear pairing
provable security
