一种高效的具有属性撤销的访问控制协议
An access control protocol with efficient revocation in cloud storage

采用外包计算技术构造一种基于密文策略的属性加密数据访问控制方法，具有高效的属性撤销功能，可以减少用户的计算量和通信量. 其最大特点是将解密秘钥分为两部分，一部分发送给云服务器，另一部分发送给用户，使得云服务器可以帮助用户解密密文，减少了用户计算量，也减少了用户和云服务器的通信量.
We construct an attribute-based encryption protocol. The protocol has the property of efficient attribute revocation，the program cloud reduce the amount of computing and communication. The secret key is divided into two parts，one part is sent to the cloud server，the other part is sent to the user. It transfers the most amount of computation to the cloud server，and reduces the amount of computation of users