Re: FBI gets new hacking tools - any ideas?

[Thorsten Fenk]

In ripley.lists.cypherpunk, you wrote:
>
>Any of these could raise some obvious concerns.  I'm curious if anyone
>might have a clear idea what "image matching software" is, and

There is a program called "PERKEO" in use by the german police. It was
designed to find kid porn on computers.
As most of these images are several years old and already known by the
police, it is possible to take a hash (e.g. MD5) of a known image and
compare it to an image found on a website/seized computer/etc.
The program fails if the image was altered.

regards
Thorsten