[6405] in cryptography@c2.net mail archive
Re: Blue Spike and Digital Watermarking with Giovanni
daemon@ATHENA.MIT.EDU (Paul Crowley)
Sun Jan 16 13:30:26 2000
To: Kevin Milani <kevin@zoetics.com>
Cc: cryptography@c2.net
From: Paul Crowley <paul@hedonism.demon.co.uk>
Date: 16 Jan 2000 15:04:17 +0000
In-Reply-To: Kevin Milani's message of "Thu, 13 Jan 2000 22:34:56 -0500"
Message-ID: <87901qvz0u.fsf@hedonism.demon.co.uk>
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.
--
__
\/ o\ paul@hedonism.demon.co.uk Got a Linux strategy? \ /
/\__/ Paul Crowley http://www.hedonism.demon.co.uk/paul/ /~\
