The document proposes an efficient and secure ciphertext-policy attribute-based proxy re-encryption (CP-ABPRE) scheme. The scheme integrates dual system encryption and selectively secure access control policies. It allows a proxy to transform an encrypted ciphertext under one access policy to another ciphertext with the same plaintext but under a new access policy. The scheme is proven to be adaptively secure against chosen ciphertext attacks in the standard model. Experimental results show that the scheme incurs low computational overhead for key generation, encryption, re-encryption and decryption operations.