Maybe no stego on eBay afterall

[Hadmut Danisch]

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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