Interesting new stego application

[Hal Finney]

Udhay Shankar N <udhay at 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

---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo at metzdowd.com