MODEL-BASED METHODS FOR STEGANOGRAPHY AND STEGANALYSIS

摘要: This paper presents methods for performing steganography and steganalysis using a statistical model of the cover medium. The methodology is general, can be applied to virtually any type media. It provides answers some fundamental questions that have not been fully addressed by previous steganographic methods, such as how large message hidden without risking detection certain achieve this maximum capacity. Current shown insecure against simple attacks. Using model-based methodology, an example method proposed JPEG images achieves higher embedding efficiency capacity than while remaining secure first order A also described defending "blockiness" Finally, presented estimating length messages with Jsteg in images.