On the role of side information in steganography in empirical covers

Jessica Fridrich

doi:10.1117/12.2001555

22 March 2013 On the role of side information in steganography in empirical covers

Jessica Fridrich

Proceedings Volume 8665, Media Watermarking, Security, and Forensics 2013; 86650I (2013) https://doi.org/10.1117/12.2001555
Event: IS&T/SPIE Electronic Imaging, 2013, Burlingame, California, United States

Abstract

In an attempt to alleviate the negative impact of unavailable cover model, some steganographic schemes utilize the knowledge of the so-called “precover” when embedding secret data. The precover is typically a higherresolution (unquantized) representation of the cover, such as the raw sensor output before it is converted to an 8-bit per channel color image. The precover object is only available to the sender but not to the Warden, which seems to give a fundamental advantage to the sender. In this paper, we provide theoretical insight for why side-informed embedding schemes for empirical covers might provide high level of security. By adopting a piece-wise polynomial model corrupted by AWGN for the content, we prove that when the cover is sufficiently non-stationary, embedding by minimizing distortion w.r.t. the precover is more secure than by preserving a model estimated from the cover (the so-called model-based steganography). Moreover, the side-informed embedding enjoys four times lower steganographic Fisher information than LSB matching.

Citation Download Citation

Jessica Fridrich "On the role of side information in steganography in empirical covers", Proc. SPIE 8665, Media Watermarking, Security, and Forensics 2013, 86650I (22 March 2013); https://doi.org/10.1117/12.2001555

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