A Multi-authority Attribute-Based Encryption Scheme with Pre-decryption

Depending on the user´s attribute, Cipher text-Policy Attribute-based Encryption (CP-ABE) can achieve user´s access control which can be widely used in cloud environment. The extended CP-ABE mechanism with multi-authorities (MA-ABE) is de-signed for the practical application. In all existing schemes, the user needs to execute the whole decryption operation. For mobile devices, it is time-consuming and inefficient. In this paper, we propose an efficient and secure multi-authority access control scheme transfer the computing to the cloud server. Our scheme implements partial decryption operation in cloud server and improves the user´s decryption efficiency, which can be applied to the scenario of access to the Internet using mobile devices.