I don't know why people are considering these terrorists to be so smart. They arrived at the Stade de France and were naively thinking they'd be able to come inside with explosives tied to them. In January, they didn't even know where the Charlie Hebdo meeting room was, they had to ask for directions and were even sent the wrong way (at first). Really, I'm far from worrying about their communication's encryption as much as I worry about the lax government.