基于密文策略属性基加密的多授权中心访问控制方案

针对单授权中心方案通信和计算开销较大的问题，该文提出一种基于密文策略属性基加密（Ciphertext-Policy Attribute-based Encryption，CP-ABE）的多授权中心访问控制方案。该方案引入属性管理器对用户属性进行分组，多个授权中心共同生成密钥，同时将部分解密交给云服务器进行。该方案减少了授权中心间的通信消耗和用户解密的资源消耗，同时通过安全性证明及与现有方案进行对比证明该方案安全高效。

CP-ABE based Data Access Control Scheme with Multi-Authorities

Considering high communication and computation overhead in single authority setting, this paper proposed an efficient multi-authorities access control scheme based on ciphertext-policy attribute-based encryption (CP-ABE). The scheme introduced an Attribute Management Server which distributes attributes, and multi-authorities centers generated the key together, and also delegated partial decryption to the cloud server. The scheme reduces the communication cost between the Attribute Authorities, and also reduces the resource consumption of users. The scheme is provable secure, and comparison with the existing schemes show that it is efficient.