可证安全的属性集合加密策略研究  

Research of provably secure attribute-sets based encryption

作　　者：孟雷[1] 宋帅峰[2] 赵晓冰[2] 

机构地区：[1]许昌学院计算机科学与技术学院,河南许昌461000 [2]郑州大学信息工程学院,河南郑州450000

出　　处：《计算机工程与设计》2013年第4期1217-1221,共5页Computer Engineering and Design

基　　金：河南省科技攻关基金项目(112102210340)

摘　　要：基于密文策略的属性集合加密(ciphertext-policy attribute-sets based encryption,CP-ASBE)是一种更具有实用性的适用于细粒度访问控制的加密方法。针对现有CP-ASBE策略构建复杂的问题,提出了一种改进的CP-ASBE策略。该策略简化了用户的密钥结构,而且选用AND门作为策略的访问结构,只有用户的密钥结构满足AND门访问结构才能解密密文。通过分析表明,该策略在判定双线性Diffie-Hellman假定条件下是选择明文攻击安全的。由实验结果可以得出,相比现有策略,该策略具有较高的加密和解密效率。Ciphertext-policy attribute-sets based encryption （CP-ASBE） is a more practical cryptographic primitive for fine- grained access control of shared data. Because of complex construction of existing CP-ASBE, an enhanced CP-ASBE is put for- ward. The scheme simplifies key structure of users, and only considers AND gates as the access structure of the scheme. User can decrypt ciphertext only if the key structure of users satisfy the AND gates of access structure. By analyzing, the scheme is proven to be Chosen Plaintext Attack （CPA） secure under the Decisional Bilinear Diffie-Hellman （DBDH） assumption. In the end, the results of experiment are shown. Comparing to the existing scheme, our scheme is more efficient in encryption and de- cryption by the results of the experiment.

关 键 词：CP-ASBE AND门 密钥结构 双线性Diffie-Hellman 选择明文攻击 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]