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- The 2nd BOWS Contest (Break Our Watermarking System) was organised within the activity of the Watermarking Virtual Laboratory (Wavila) of the European Network of Excellence ECRYPT (http://www.ecrypt.eu.org/) between the 17th of July 2007 and 17th of April 2008.

BOWS-2 was composed of 3 independent challenges, called "Episodes", of 3 months each:
  - Episode 1: Robustness against image processing , best PSNR: 24.3dB, see the results here.
  - Episode 2: Sensitivity against oracle attacks , best PSNR: 50.2dB, see the results here.
  - Episode 3, Security against information leakages , best PSNR: 46.2dB, see the results here.

See also the "Rules" section for more information about the rules of Episode 3. Any question regarding the contest may be addressed to:


If you want to continue this challenge offline, here is the different material that you can use:
- the description of watermarking algorithm "Broken Arrows" , EURASIP Journal on Information Security, Volume 2008 (2008), Article ID 597040, 13 pages here.
- the source code of Broken Arrows here.
- the original images used during the different episodes here.
- the 10 000 original images used during Ep.3 here.

BOWS-2 was also supported by the French ANR projects Nebbiano and Estivale.

New: a new constest on Steganography (called BOSS for "Break Our Steganographic System") is going to be organised in 2010. See HERE.