SEPARABLE REVERSIBLE INFORMATION TROUNCING IN ENCRYPTED IMAGE

Abstract

This work proposes a novel scheme for separable reversible data hiding in encrypted images. In the first phase, a content owner en crypts the original uncompressed image using an encryption key. Then, a data-hider may compress the least significant bits of the encrypted image using a data-hiding key to create a sparse space to accommodate some ad ditional data. With an encrypted image containing additional data, if a re ceiver has the data-hiding key, he can extract the additional data though he does not know the image content. If the receiver has the encryption key, he can decrypt the received data to obtain an image similar to the orig inal one, but cannot extract the additional data. If the receiver has both the data-hiding key and the encryption key, he can extract the additional data andrecover the original content without any error by exploiting the spatial correlation in natural image when the amount of additional data is not too large.