Separable Reversible Data Hiding with RC4 Algorithm

Abstract

this paper proposes a unique technique for separable reversible information hiding in encrypted pictures.
Within first phase, a content owner encrypts the initial uncompressed image using a cryptographic key that uses RC4
cryptographic algorithm. Then, an information-hider may compress the smallest amount significant bits of the
encrypted image using a data-hiding key using LSB technique accommodate small amount of data. With an encrypted
image containing extra information, if a receiver has the data-hiding key, he will extract the extra information
although it doesn't recognize the image content. If the receiver has the cryptography key, it can decode the received
information to get a picture almost like the initial one, however cannot extract the extra information. If the receiver
has both data-hiding key as well as cryptography key, it can extract information and recover the initial content with
none error by exploiting the spatial correlation in natural image once the quantity of additional information isn't
overlarge.