Integrating the Functional Encryption and Proxy Re-cryptography to Secure DRM Scheme.

The current Digital Rights Management (DRM) systems use attribute-based encryption (ABE) and proxy re-encryption (PRE) to achieve fine-grained access control in cloud computing. However, these schemes have some limitations particularly in terms of security, functionality and also higher decryption time which grows linearly with the complexity of access policies. In this paper, we propose a novel DRM scheme founded on a deterministic finite automata-based functional proxy re-encryption (DFA-based FPRE) scheme which has been proven to be secure against CCA in the standard model. In particular, we leverage the DFA-based FPRE scheme to realize fine-grained access control over encrypted contents among a set of users. Furthermore, a secure content key distribution protocol and efficient revocation mechanism are provided. Moreover, we tackle the critical issue of high computation at the user side, by outsourcing computation into (DFA-based FPRE) scheme for the first time. In comparison, our scheme achieves higher efficiency and smaller computation time against state-of-the-art.