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Proceedings Paper

Additive non-Gaussian noise attacks on the scalar Costa scheme (SCS)
Author(s): Roman Tzschoppe; Robert Bauml; Robert Fischer; Johannes Huber; Andre Kaup
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Paper Abstract

The additive attack public mutual information game is explicitly solved for one of the simplest quantization based watermarking schemes, the scalar Costa scheme (SCS). It is a zero-sum game played between the embedder and the attacker, and the payoff function is the mutual information. The solution of the game, a subgame perfect nash equilibrium, is found by backward induction. Therefore, the Blahut-Arimoto algorithm is employed for numerically optimizing the mutual information over noise distributions. Although the worst case distribution is in general strongly non-Gaussian, the capacity degradation compared to a suboptimal Gaussian noise attack is quite small. The loss, if the embedder optimizes SCS for a Gaussian attack but the worst case attack is employed, is negligible.

Paper Details

Date Published: 21 March 2005
PDF: 10 pages
Proc. SPIE 5681, Security, Steganography, and Watermarking of Multimedia Contents VII, (21 March 2005);
Show Author Affiliations
Roman Tzschoppe, Univ. of Erlangen-Nuremberg (Germany)
Robert Bauml, Univ. of Erlangen-Nuremberg (Germany)
Robert Fischer, Univ. of Erlangen-Nuremberg (Germany)
Johannes Huber, Univ. of Erlangen-Nuremberg (Germany)
Andre Kaup, Univ. of Erlangen-Nuremberg (Germany)

Published in SPIE Proceedings Vol. 5681:
Security, Steganography, and Watermarking of Multimedia Contents VII
Edward J. Delp III; Ping W. Wong, Editor(s)

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