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Jin, Cancan, Feng, Xinyu, Shen, Qingni.  2016.  Fully Secure Hidden Ciphertext Policy Attribute-Based Encryption with Short Ciphertext Size. Proceedings of the 6th International Conference on Communication and Network Security. :91–98.

In ciphertext policy attribute-based encryption scheme, access policies are associated with ciphertext and tied to it. It is necessary to hide the access policy in the most sensitive spots such as political, medical and economic fields, that is, receiver's anonymity. In this paper, we propose an efficient CP-ABE construction with hidden policy and prove it to be fully secure under static assumptions applying the dual system encryption methodology. Access structures in our construction are AND gates on positive, negative and wildcard attributes and the ciphertext size is short, which is only concerned with the number of wildcards.