通信学报 ›› 2017, Vol. 38 ›› Issue (4): 35-45.doi: 10.11959/j.issn.1000-436x.2017072

• 学术论文 • 上一篇    下一篇

标准模型下可证明安全的无证书广义签密

牛淑芬,牛灵,王彩芬,李亚红   

  1. 西北师范大学计算机科学与工程学院,甘肃 兰州730070
  • 修回日期:2017-03-02 出版日期:2017-04-01 发布日期:2017-07-20
  • 作者简介:牛淑芬(1976-),女,甘肃通渭人,西北师范大学副教授、硕士生导师,主要研究方向为密码学、云计算和大数据网络的隐私保护。|牛灵(1991-),女,甘肃通渭人,西北师范大学硕士生,主要研究方向为密码学。|王彩芬(1963-),女,河北安国人,西北师范大学教授、博士生导师,主要研究方向为信息安全、密码学。|李亚红(1984-),女,甘肃定西人,西北师范大学博士生,主要研究方向为密码学。
  • 基金资助:
    国家自然科学基金资助项目(61562077);国家自然科学基金资助项目(61662071)

Certificateless generalized signcryption scheme in the standard model

Shu-fen NIU,Ling NIU,Cai-fen WANG,Ya-hong LI   

  1. College of Computer Science and Engineering,Northwest Normal University,Lanzhou 730070,China
  • Revised:2017-03-02 Online:2017-04-01 Published:2017-07-20
  • Supported by:
    The National Natural Science Foundation of China(61562077);The National Natural Science Foundation of China(61662071)

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。

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

Abstract:

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.

Key words: certificateless cryptography, generalized signcryption, standard model, malicious-but-passive KGC attacks

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