Abstract
How to effectively protect the security of the shared data is a key problem to be solved urgently in wireless body area network (WBAN). Considering of the limitation on resources of sensor nodes and the diversity of potential data requestor in WBAN, we propose a multi-authority ciphertext-policy attribute-based encryption (CP-ABE) access control scheme in cloud storage environment which is provably secure against chosen plaintext attack (CPA) under the standard model. The scheme adopts the idea of hybrid encryption to reduce the computational overhead of data encryption, that is, use symmetric key to encrypt data to ensure efficiency, and use the CP-ABE mechanism to encrypt symmetric key to ensure security. And use of disjunctive normal form structure instead of AND/OR structure of traditional CP-ABE algorithm, effectively improve the system's decryption efficiency. By analyzing the efficiency of encryption and decryption, that shows the scheme is suitable for WBAN.
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