for the purposes of access control or identification related to particular type of audio. This top-secret information is not “visible” for a user. The leading determinationfor watermarking by audio is to defend beside probable extortions in the audio records and for copyright harm or illegal altering; reality for such information can be unsure by audio watermarking. Steganography and cryptography are two techniques these techniques are related in the manner that they together are used to safeguard private facts. There islack in characteristic of original image we recommend a generalized form of Reversible Contrast Mapping (RCM)is an in complex integer transform that applies to pairs ofpixels. For image watermarking Contrast mapping isinvertible procedure, because least significant bits (LSBs) of the transformed pixels are forfeit. The data spaceoccupied by the LSBs is expedient for information hiding. The embedded information bit-rates of reversible watermarking structure are highest bit-rates till date. Thesystem does not need further records compression, and, in terms of mathematical complexity, it is having lowest complexity. Also robustness against cropping can be guaranteed