Re: Blue Spike and Digital Watermarking with Giovanni

[Paul Crowley]

As far as I know, all fielded watermarking schemes can be defeated
with simple, invisible distortions of the image - see

http://www.cl.cam.ac.uk/~fapp2/steganography/

for work done by Fabien Petitcolas and Ross Anderson.  You don't even
have to have more than one copy of the picture or know very much about
the scheme in use.
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