Abstract
The second Break Our Watermarking System (BOWS-2) contest exposed a watermarking algorithm named Broken Arrows (BA) to worldwide attacks. In its second episode, the previously existing daily limit of 30 oracle calls per IP address was lifted to allow for sensitivity analysis. Often disrespected because of their extensive oracle use, sensitivity attacks can reveal up to one bit of information about the watermark in each experiment. In this paper we describe how we circumvented BA’s countermeasures against sensitivity attacks.
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Westfeld, A. (2009). Fast Determination of Sensitivity in the Presence of Countermeasures in BOWS-2. In: Katzenbeisser, S., Sadeghi, AR. (eds) Information Hiding. IH 2009. Lecture Notes in Computer Science, vol 5806. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04431-1_7
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DOI: https://doi.org/10.1007/978-3-642-04431-1_7
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