Perturbed quantization steganography |
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Authors: | Jessica Fridrich Miroslav Goljan David Soukal |
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Affiliation: | (1) SUNY Binghamton, Department of ECE, Binghamton, NY 13902-6000, USA;(2) SUNY Binghamton, Department of CS, Binghamton, NY 13902-6000, USA |
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Abstract: | In this paper, we use the recently proposed wet paper codes and introduce a new approach to passive-warden steganography called
perturbed quantization. In perturbed quantization, the sender hides data while processing the cover object with an information-reducing
operation that involves quantization, such as lossy compression, downsampling, or A/D conversion. The unquantized values of
the processed cover object are considered as side information to confine the embedding changes to those unquantized elements
whose values are close to the middle of quantization intervals. This choice of the selection channel calls for wet paper codes
as they enable communication with non-shared selection channel. Heuristic is presented that indicates that the proposed method
provides better steganographic security than current JPEG steganographic methods. This claim is further supported by blind
steganalysis of a specific case of perturbed quantization for recompressed JPEG images. |
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Keywords: | Perturbed quantization Wet paper code Adaptive Security Steganography |
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