Attacks on Unknown Data Hiding Algorithms

Abstract

In the last chapter, we discussed watermark attacks with the embedding and detection algorithms known to analysts, which is the case for most attacks studied in the literature. The public challenges organized by the Secure Digital Music Initiative (SDMI) in Fall 2000 provided an opportunities for researchers to study attacks under an emulated competitive environment. We will discuss in this chapter attacks that have appeared to be successful on the watermarking schemes under SDMI’s consideration at that time. We shall point out weaknesses of those watermark schemes and propose some directions of improvements. We will also discuss a few general approaches that could be used by an attacker in a real competitive environment, thus setting a framework for studying the robustness and security of data hiding systems.