Reverse-engineering a watermark detector using an oracle

Authors:
Scott Craver;Idris Atakli;Jun Yu
Affiliations:
Department of Electrical and Computer Engineering, Binghamton University, Binghamton, NY;Department of Electrical and Computer Engineering, Binghamton University, Binghamton, NY;Department of Electrical and Computer Engineering, Binghamton University, Binghamton, NY
Venue:
EURASIP Journal on Information Security
Year:
2007

Citing 4
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Abstract

The Break Our Watermarking System (BOWS) contest gave researchers three months to defeat an unknown watermark, given three marked images and online access to a watermark detector. The authors participated in the first phase of the contest, defeating the mark while retaining the highest average quality among attacked images. The techniques developed in this contest led to general methods for reverse-engineering a watermark algorithm via experimental images fed to its detector. The techniques exploit the tendency of watermark algorithms to admit characteristic false positives, which can be used to identify an algorithm or estimate certain parameters.