[11135] in cryptography@c2.net mail archive
Re: Maybe no stego on eBay afterall
daemon@ATHENA.MIT.EDU (Hadmut Danisch)
Fri Jul 19 13:29:13 2002
From: Hadmut Danisch <hadmut@danisch.de>
Date: Fri, 19 Jul 2002 10:34:33 +0200
To: Nelson Minar <nelson@monkey.org>
Cc: cryptography@wasabisystems.com
In-Reply-To: <15670.65478.136672.341983@cabernet.nelson.monkey.org>
On Thu, Jul 18, 2002 at 10:49:58AM -0700, Nelson Minar wrote:
>
> Chet Hosmer ... said that in his research, very few messages on eBay
> show signs of being infected by terrorists. About one in 100,000
> pictures "appears suspicious," but a much smaller number -- "one in
> every 15 to 20 million files" -- is "something that we really
> believe is a real hidden message."
>
> I wonder which it is? 0.6%? Or one in every 20 million files? Either
> way, they're not giving out any examples. I bet they're still spending
> the Air Force's money to do the study, though.
What's the hamming distance between eBay pictures/messages
"containing" stego contents?
What's the probability that a random, clean picture is
falsely tested positive? How many "unusual" bits does it take
to make a picture appear as being a stego pic?
Hadmut
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