Ernest Miller is well worth reading on the problems law enforcement authorities have in surveilling the Net. The FBI are seeking to expand Carnivore. Miller's repsonse? They're onto a hiding to nothing because of the architecture of the Net.

"The amount of intervention in technology development necessary for the FBI and DOJ to accomplish what they want with regard to wiretapping is enormous. The costs will be both direct (money out of consumer's pockets) and indirect (loss of innovation). However, that is only half the picture. Unfortunately for the FBI, the costs to defeat the wiretapping are relatively small and will continue to decrease. We have here an asymmetric situation that will only grow more asymmetric as time goes on.

The problem is with the underlying architecture of the internet. Advances in technology along with the end-to-end/layers principle mean that it will always be cheaper to add encryption to the edges of the network than to increase the amount of surveillance at the center of the network. How much does it cost to write an encrypted VoIP app? Not much. How much does it cost to build the surveillance mechanism and conduct the surveillance across all possible ISPs? A heck of a lot more.

Ok. Now that the first encrypted VoIP app is compromised ... how much will it cost to build another encrypted layer on top of the first one? How much will it cost to conduct surveillance on this new layer? Hmmmm, if this progression continues, as we add additional layers of encryption and surveillance, the costs will increasingly diverge. Not a game you can win ultimately. In fact, it doesn't make much sense to even start. The FBI should be happy with what they've got...

...If I were the FBI, I wouldn't waste my time on a battle I ultimately couldn't win and instead would concentrate my efforts on the place where I could still achieve my goals - the ends. You want to know what someone is up to online? I would recommend, for example, key loggers, "real" spyware, and social engineering. It ain't gonna be easy, but you have a chance of winning in the long term. The sooner you quit a race you can't win, the faster you can enter a race where you have a chance."

He's got a point but it's one that takes longer than three seconds to grasp, so I don't see the politicos getting it any time soon. It's easy to spend lots of money and say we are spending lots of money fighting crime, and spin an illusion that such tactics work. It's hard to do the kinds of things Ernest is talking about and there are no simple tick box targets to wave in front of the media to illustrate success.

But law enforcement is hard.