[81879] in cryptography@c2.net mail archive
Re: Interesting new stego application
daemon@ATHENA.MIT.EDU ("Hal Finney")
Fri Mar 23 15:24:50 2007
To: cryptography@metzdowd.com, udhay@pobox.com
Date: Fri, 23 Mar 2007 09:18:25 -0800 (PST)
From: hal@finney.org ("Hal Finney")
Udhay Shankar N <udhay@pobox.com> writes:
> http://news.bbc.co.uk/2/hi/technology/6361891.stm
>
> A technology that can "hide" information in plain sight on printed
> images has begun to see the first commercial applications.
> ...
> Fujitsu's technique works by taking advantage of the sensitivities of
> the human eye, which struggles to see the colour yellow.
>
> "The key is to take the yellow hue in the picture and we skew that
> ever so slightly to create a pattern," said Mr Nelson.
This has been in use for years to watermark documents from certain
printers to enable forensic tracking of which printer produced a given
document, as well as when the document was printed. It is presumed
that this is for the assistance of law enforcement. The EFF has a good
article on about it at http://www.eff.org/Privacy/printers .
Hal Finney
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