Abstract
This paper work deals with the study of interest in the fields of Steganography and Steganalysis with the image, audio or video stego media against the corresponding cover media (without the hidden information) and understand the process of embedding the information and its detection. Indeed, steganography involves hiding information in a cover media to obtain the stego media, in such a way that the cover media is perceived not to have any embedded message for its unintended recipients. Steganalysis is the mechanism of detecting the presence of hidden information in the stego media and it can lead to the prevention of disastrous security incidents. In this paper, we provide a critical review of the steganalysis algorithms available to analyze the characteristics of audio and image stego media against the corresponding cover media and understand the process of embedding the information and its detection. We anticipate that this paper can also give a clear picture of the current trends in steganography so that we can develop and improvise appropriate steganalysis algorithms.