摘要
Liu等在2010年提出了一种在标准模型下可证明安全的无证书签密算法(简称LHZ算法),但后续的研究成果显示LHZ算法实际上是不安全的。为了克服LHZ算法的不足,首先改进LHZ签密算法,然后以此为基本的签密算法提出一种新的无证书广义签密算法。同时给出了抵抗有预谋的KGC被动攻击(malicious-butpassive KGC attack)的无证书广义签密算法的安全性模型,并在标准模型下证明了该算法在判定性双线性Diffie-Hellman困难问题和计算性Diffie-Hellman困难问题假设下是安全的。此外,数值实验结果表明所提方案是有效的。
In 2010, Liu, et al. proposed a certificateless signcryption scheme in the standard model, but many analyses revealed that Liu＇s scheme was insecure in fact. To overcome the disadvantages, the scheme was improved and a certificateless generalized signcryption scheme was constructed. In addition, a formal security model for the proposed scheme against the malicious-but-passive KGC attacks was introduced. Furthermore, the proposed scheme was proven to be secure under the decisional bilinear Diffie-Hellman and the computational Diffie-Hellman intractability assumptions in the standard model. Numerical results illustrate that the proposed algorithm is efficient.
作者
牛淑芬
牛灵
王彩芬
李亚红
NIU Shu-fen NIU Ling WANG Cai-fen LI Ya-hong(College of Computer Science and Engineering, Northwest Normal University, Lanzhou 730070, Chin)
出处
《通信学报》
EI
CSCD
北大核心
2017年第4期35-45,共11页
Journal on Communications
基金
国家自然科学基金资助项目(No.61562077
No.61462077
No.61662071)~~
关键词
无证书密码体制
广义签密
标准模型
有预谋的KGC被动攻击
certificateless cryptography
generalized signcryption
standard model
malicious-but-passive KGC attacks
