Steganography and Steganalysis of digital images is a cat-and-mouse game. In recent work, Fridrich, Goljan and Du introduced a method that is surprisingly accurate at determining if bitmap images that originated as JPEG files have been altered (and even specifying where and how they were altered), even if only a single bit has been changed. However, Steganographic embeddings that encode embedded data in the JPEG coefficients are not detectable by their JPEG compatibility Steganalysis. This paper describes a Steganographic method that encodes the embedded data in the spatial domain, yet cannot be detected by their Steganalysis mechanism. Furthermore, we claim that our method can also be used as a Steganographic method on files stored in JPEG format. The method described herein uses a novel, topological approach to embedding. The paper also outlines some extensions to the proposed embedding method.
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