一种改进的属性加密方案  

Improved Attribute-based Encryption Scheme

作　　者：宋文纳 向广利[1] 李安康[1] 张月欣[1] 陶然[1] SONG Wen-na XIANG Guang-li LI An-kang ZHANG Yue-xin TAO Ran(School of Computer Science and Technology, Wuhan University of Technology, Wuhan 430070, Chin)

机构地区：[1]武汉理工大学计算机科学与技术学院,武汉430070

出　　处：《计算机科学》2017年第1期167-171,193,共6页Computer Science

摘　　要：属性加密适合一对多的广播加密环境,很好地保护了用户的隐私,而且容易实现细粒度的访问控制。然而已有的属性加密方案中安全性假设过强、运算效率较低。通过对Waters方案的安全性假设进行分析,提出了随机参数满足一定特定关系的Eq-BDHE假设。基于该假设实现了一种改进的CP-ABE加密方案。安全分析和对比实验表明,改进方案降低了安全假设强度,在标准模型下能够抵抗选择明文攻击,同时减少了随机参数的数量,提高了运算效率。Attribute-based encryption is suitable for one-to-many broadcast encryption environment, and is easy to im- plement fine-grained access control, protecting the user＇s privacy well. This paper summarized the development present situation of the attribute-based encryption. Through the analysis of the security assumption of Waters scheme, Eq-BD- HE was presented with its the random parameters satisfying certain specific relation. The improved CP-ABE encryption scheme was implemented. The security analysis and comparative experiments show that the new scheme has better secu- rity, reduces the number of system parameters, and improves the efficiency of encryption and decryption operations.

关 键 词：属性加密 q-BDHE 线性秘密共享 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]