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This paper proposes a new steganographic scheme relying on the principle ofcover-source switching, the key idea being that the embedding should switchfrom one cover-source to another. The proposed implementation, called NaturalSteganography, considers the sensor noise naturally present in the raw imagesand uses the principle that, by the addition of a specific noise thesteganographic embedding tries to mimic a change of ISO sensitivity. Theembedding methodology consists in 1) perturbing the image in the raw domain, 2)modeling the perturbation in the processed domain, 3) embedding the payload inthe processed domain. We show that this methodology is easily tractablewhenever the processes are known and enables to embed large and undetectablepayloads. We also show that already used heuristics such as synchronization ofembedding changes or detectability after rescaling can be respectivelyexplained by operations such as color demosaicing and down-scaling kernels.

Natural Steganography: cover-source switching for better steganography