Steganography is the art of hiding information in images and other documents so that an eavesdropper will not even realize that information has been hidden. Digitized images are often used to hide messages for covert communication, which in other terms are referred as image steganography. To embed a bit strings into an image file, one can either choose the pixel domain or the frequency domain of the image. Modern goal of steganography is to keep its mere presence undetectable, but steganographic systems-because of their invasive nature-leave behind detectable traces in the cover medium. Even if secret content is not revealed, the existence of it is: modifying the cover medium changes its statistical properties, so eavesdroppers can detect the distortions in the resulting stego medium's statistical properties.
This paper focuses on hiding secret data in digital images using frequency domain. A novel strategy for hiding data in digital images is proposed in this paper. The two proposed algorithms for hiding and retrieving data are based on frequency domain manipulation of digital images. Further some of the methods and data structures are explained in brief in context with the future implementations.
Covert Channel, Ciphertext, Covertext, Steganography, Watermarking
