Achieving Lightweight and Secure Access Control in Multi-authority Cloud

Cloud computing has become a vital part of our daily life. While enjoying the provided convenience, users may lose control on their personal data since the ownership of the data is separated from the administration of them, this concern becomes more serious in the multi-authority cloud environment. In this paper, we propose a novel access control scheme, termed easy-ACCESS, which achieves lightweight and secure data access control for resource-limited devices in multi-authority cloud. Our easy-ACCESS simultaneously enjoys the following properties: i) shorter size of the decryption keys, which increase linearly with the number of authorities rather than the number of attributes, ii) lower computation cost, we delegate almost all of the decryption cost to the decryption service provider, and iii) provably secure, the proposed scheme is provably secure under the selective security model. Thoroughly theoretical analysis and performance evaluation indicate the effectiveness and efficiency of our proposed easy-ACCESS.