Separable extraction of concealed data and compressed image

A novel technique for Separable Reversible Data Hiding on Encrypted and transform - based compressed image is proposed. Reversible Data Hiding is the method of hiding data inside a cover file, so that both the data and the cover file could be recovered lossless at the receiver. The transmitter side of such systems involves a cover image, additional data, encryption key and a data hiding key The original image is first encrypted, compressed and then embedded with the secret data. The receiver thus needs to decrypt and extract the hidden information. Important aspects of data hiding include minimizing distortion and improving embedding capacity. Capacity improvement is achieved via compression. Thus compressed image would accumulate more secret data. Amount of secrecy could be further enhanced by compression techniques. Compression could be either lossy or lossless. Also, this method of RDH could be implemented either using a non-separable receiver or a separable receiver. This paper focuses on separable reversible data hiding on encrypted and compressed images.