通信学报 ›› 2017, Vol. 38 ›› Issue (11): 54-64.doi: 10.11959/j.issn.1000-436x.2017219

• 学术论文 • 上一篇    下一篇

新的格上基于身份的分级加密方案

叶青,胡明星,汤永利(),刘琨,闫玺玺   

  1. 河南理工大学计算机科学与技术学院,河南 焦作 454000
  • 修回日期:2017-06-05 出版日期:2017-11-01 发布日期:2017-12-13
  • 作者简介:叶青(1981-),女,辽宁营口人,博士,河南理工大学讲师、硕士生导师,主要研究方向为密码学。|胡明星(1994-),男,河南鹿邑人,河南理工大学硕士生,主要研究方向为密码学。|汤永利(1972-),男,河南孟州人,博士后,河南理工大学教授、硕士生导师,主要研究方向为信息安全、密码学。|刘琨(1978-),女,河南焦作人,河南理工大学副教授、硕士生导师,主要研究方向为信息安全、密码学。|闫玺玺(1985-),女,河南灵宝人,博士,河南理工大学讲师、硕士生导师,主要研究方向为密码学。
  • 基金资助:
    “十三五”国家密码发展基金资助项目(MMJJ20170122);国家自然科学基金资助项目(61300216);河南省科技厅基金资助项目(142300410147);河南省教育厅基金资助项目(18A413001);河南省教育厅基金资助项目(16A520013);河南理工大学博士基金资助项目(B2014-044);河南理工大学博士基金资助项目(B2016-36)

Novel hierarchical identity-based encryption scheme from lattice

Qing YE,Ming-xing HU,Yong-li TANG(),Kun LIU,Xi-xi YAN   

  1. College of Computer Science and Technology,Henan Polytechnic University,Jiaozuo 454000,China
  • Revised:2017-06-05 Online:2017-11-01 Published:2017-12-13
  • Supported by:
    The “13th Five-Year” National Crypto Development Foundation(MMJJ20170122);The National Natural Science Foundation of China(61300216);The Project of Science and Technology Department of Henan Province(142300410147);The Project of Education Department of Henan Province(18A413001);The Project of Education Department of Henan Province(16A520013);Doctoral Fund of Henan Polytechnic University(B2014-044);Doctoral Fund of Henan Polytechnic University(B2016-36)

摘要:

针对格上基于身份的分级加密(HIBE,hierarchical identity-based encryption)体制中用户密钥提取算法复杂度过高和陷门尺寸膨胀率大的问题,提出一种新的HIBE方案。首先,利用隐式扩展法对HIBE方案中的原像采样算法优化,然后,结合MP12陷门派生算法提出一种高效的HIBE用户密钥提取算法,并基于该算法结合对偶 LWE 算法完成 HIBE 方案构造。对比分析表明,所提方案的效率较同类方案在系统建立和用户密钥提取阶段均有提升,陷门尺寸与系统分级深度仅成线性增长关系,且优化后的原像采样算法一定程度上可解决MP12陷门派生算法在陷门派生后高斯参数增长的问题。在标准模型下,方案安全性归约至判定性 LWE 问题的难解性,并包含严格的安全性证明。

关键词: 格, 基于身份的分级加密, 陷门派生, 标准模型, 容错学习

Abstract:

Aiming at the high complexity in user’s private key extraction and large expansion ratio of trapdoor size in previous hierarchical identity-based encryption (HIBE) schemes,a new HIBE scheme was proposed.The implicit extension method to improve preimage sampling algorithm was used,and then combined the improved algorithm with MP12 trapdoor delegation algorithm to construct an efficient HIBE user’s private key extraction algorithm.Finally,the new extraction algorithm and the Dual-LWE algorithm was integrated to complete the scheme.Compared with the similar schemes,the efficiency of the proposed scheme was improved in system establishment and user’s private key extraction stage,the trapdoor size grows only linearly with the system hierarchical depth,and the improved preimage sample algorithm partly solves the Gaussian parameter increasing problem induced by MP12 trapdoor delegation.The security of the proposed scheme strictly reduces to the hardness of decisional learning with errors problem in the standard model.

Key words: lattice, hierarchical identity-based encryption, trapdoor delegation, standard model, learning with error

中图分类号: 

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