A Review on Blind Still Image Steganalysis Techniques Using Features Extraction and Pattern Classification Method

Steganography is the technique for hiding secret information in other data such as still, multimedia images, text, audio. Whereas Steganalysis is the reverse technique in which detection of the secret information is done in the stego image. Steganalysis can be classified on the basis of the techniques used classified statistical techniques, pattern classification techniques and visual detection techniques .All the existing techniques can be broadly classified on the basis of the information required for the designing of the steganalysis. They are targeted and blind steganalysis In targeted technique, we first look at steganalysis techniques is designed for a particular steganographic embedding algorithm in mind whereas in blind steganalysis is general class of steganalysis techniques which can be implemented with any steganographic embedding algorithm, even an unknown algorithm. In this paper, an extensive review report is presented chronologically on the Blind Image Steganalysis for the still stego images using the classification techniques.