Unfortunately, Im sure that terrorists are using tor/pgp to communicate. I mean, why wouldnt they? Also, NSA surely can track through Tor. Im sure they have the technology, but if the terrorists kept moving their place of communication, it would be tough for even NSA go get them. I dont know how Tor works. But it seems like if they could make a new onion address every so many days, that they would be tough to track down. But the ironic thing is none of us have any clue on what type of technology the government has in their hands. They may have a program right now that can break any pgp code within minutes.. This is the only bad thing about being anonymous. It attracts the very undesirable..Child porn/terrorists, etc.