Image Steganography

Steganography is one of the methods of secret communication that hides the existence of hidden Message. It can be defined as the study of invisible communication that usually deals with the ways of hiding the existence of the communicated message. The hidden message may be text, image, audio, video, etc. The files can be a cover image after inserting the message into the cover image using stego-key. It is referred to as stego-image. Steganography is now more important due to the exponential growth and secret communication of potential computer users on the internet. In this paper I have analyzed various steganography techniques. It also given an overview of steganography, different methods of Steganography, its applications, how it is different from cryptography. The image cryptography and steganography performed infrequency domain using random phase mask encoding are presented. These of random phase maskallowsto Dec correlate initial image and makes it unrecognized. This property is used for proposed image encryption and for steganography to increase the security level of the encoded image and to make it less visible. Finally, two keys are needed decrypt the image. The efficiency of the proposed approach is Demonstrated by the computer modeling.