Can any foreign terrorist organization count on having encryption that would defeat the National Security Agency's efforts to break the encryption? Surely the first thing for anyone hiding from the United States government to do is simply practice good tradecraft (as bin Laden and his group have long done) and never let the message be accessible to the United States government in the first place. I wouldn't count on PGP or any other software solution for encryption that is readily available worldwide to be secure against NSA attempts to decrypt it. That's especially what any "high value" terrorism suspect should keep in mind.