>No, it's already beat. Let's say I put a Pentium III in a computer with an ethernet adapter (for a cable modem, say), connect to the internet and hack into the Pentagon. Even if the DoD is wise enough to capture those numbers (the P3 s/n and my XNS/MAC address) they can't prove it was ME who did the hacking, just someone using my computer (or someone _pretending_ to use my computer).

Yes, but that's legalistic...a major hacker probably wants to be a lot less visible than that. But I'm sure they'll find ways...