Compendium of Reversible Data Hiding

In any communication, security is the most important issue in today’s world. Lots of data security and data hiding algorithms have been developed in the last decade, which worked as motivation for the research. In the era of internet, in every communication images play a very important role. Images are used for secret communication also like for military purposes, hiding the serial number or copyright also to embed the virus and other bad things etc. To hide data in image in such a way that the existence of the message is unknown is steganography. Different techniques are used to hide data in the image to achieve high quality of stego image and high embedding capacity. In this paper, some of those steganographic techniques are discussed.