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ROC Curves for Steganalysts

There are different approaches in the literature for the assessment of steganographic algorithms and steganalytic attacks. In the early papers it was considered sufficient to show the existence of an effect for one or a few examples only. The more the area of steganography evolved, the more diverse became the goals and the harder to measure the improvements. Many branches of science are facing the same problem. More and more elaborate methods are used for assessment. We discuss aspects of the analysis of receiver operating characteristics (ROC) from a steganographer’s point of view. ROC curves permit a reliable assessment of steganalytic detectors, independent of their decision threshold.