>Any of these could raise some obvious concerns. I'm curious if anyone
>might have a clear idea what "image matching software" is, and whether
>"steganography detection software" is even feasible and what one might
>do to defeat it. The others are fairly obivious in both intent and
>viability.
I've been thinking about this issues for some time and have an idea what
they may be referring to. Politics and ethics aside, here's a technical
concept:
Reading about other child porn busts like Innocent Images and some info on
the workings of these groups, it appears that "bona fides" are sometimes
established between pedophiles through submission of personal collections
of child porn. One data point that stuck in my mind about this was a
"club" that required submission of 10k! images as the price of admission.
Assuming the body of child porn in circulation is of some reasonable size,
and grows far less rapidly than adult porn, it should be feasible to
construct a "fingerprint" style database by scanning the collections the
FBI (and some postmasters) are known to have in their posession.
An automated tool could then conceivably be created in conjunction with a
statefull inspection firewall or statefull passive line tap to recognize
when significant quantities of registered porn are being transmitted.
The obvious counter for this would be encryption or steganography, which
was also mentioned.
