Fine-Grained Data Sharing Supporting Attribute Extension in Cloud Computing

Attribute-based encryption (ABE) can be used for implementing fine-grained data sharing in cloud computing. However, most of the existing ABE schemes cannot realize attribute extension and provable security simultaneously. In this paper, we propose a fine-grained attribute-based data sharing system based on a hybrid encryption mechanism. A rigorous security proof indicates that the proposed scheme is selective-secure under the decisional bilinear Diffie-Hellman assumption. In particular, the proposed data sharing scheme can efficiently support attribute extension and allow AND-gate access policies with multiple attribute values and wildcards. Extensive simulation results indicate that the proposed scheme is extremely suitable for data sharing in cloud computing.