FDCO: attribute-based fast data cloud-outsourcing scheme for mobile devices

We propose an attribute-based fast data cloud-outsourcing (FDCO) scheme, which shows great performance in mobile devices. Technically, this work is a CCA-secure online/offline key encapsulation scheme based on ciphertext-policy attribute-based encryption with public validity test and indirect user revocation mechanism. We adapt it to a mobile cloud-outsourcing scenario and present a concrete system. Our scheme is equipped with the following desirable properties: First, encapsulation needs only several lightweight online modular addition/multiplication operations, which is appealing to mobile users. Second, it is equipped with an efficient indirect user revocation mechanism to support access credential revocation. Third, it supports public encapsulation validity test, which enables auditors to filter invalid data, so as to prevent attackers from sending invalid data to stuff users’ accounts. Finally, we prove its security against chosen-ciphertext attacks (CCA) in the standard model. We conduct theoretical analyses and extensive experiments to show that our scheme is practical and efficient in application.