可证安全的属性集合加密  

PROVABLY SECURED ATTRIBUTE-SETS ENCRYPTION

作　　者：孟雷[1] 

机构地区：[1]许昌学院计算机科学与技术学院,河南许昌461000

出　　处：《计算机应用与软件》2014年第2期321-324,共4页Computer Applications and Software

基　　金：河南省科技攻关项目(112102210340)

摘　　要：针对现有密文策略的属性集合加密CP-ASBE(Ciphertext-Policy Attribute-Sets Based Encryption)构建复杂以及无法达到更高的安全性要求的问题,提出一种改进的CP-ASBE方案。该方案通过简化用户的密钥结构以及仅考虑AND门的访问结构进行构建,为增强其安全性,方案引入强存在性不可伪造签名机制。通过分析证明,该策略在判定双线性Diffie-Hellman假定条件下是选择密文攻击安全的。模拟实验表明,相比现有方案,该方案具有较高的加密和解密效率。Aiming at the problems of existing ciphertext-policy attribute-sets based encryption （CP-ASBE）scheme that it is complex in construction and unable to satisfy the securer requirement,an enhanced CP-ASBE scheme is put forward.The scheme is constructed in the way of simplifying key structure of users and only considering AND gates as the access structure.In order to enhance its security,the scheme introduces the signature mechanism with strong existential unforgeability.By analysing,the scheme is proven to be chosen the ciphertext attack （CCA）secure under the decisional bilinear Diffie-Hellman （DBDH）assumption.Finally,the simulation experimental results show that the scheme is more efficient in encryption and decryption comparing with existing scheme.

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

分 类 号：TP391[自动化与计算机技术—计算机应用技术]