Burner phones and mysterious encryption: how is Isis communicating now?

three teams in Paris were comparatively disciplined. They used only new phones that they would then discard, including several activated minutes before the attacks, or phones seized from their victims.What was odd about the phones found by investigators was that none of them had any electronic messages on them whatsoever. This implies that the
attackers had some other way of exchanging information which didn't rely on email, or recognisable apps like Whatsapp.During the Bataclan raid, according to a hostage, one of the attackers "pulled out a laptop" and turned it on to show a "line of gibberish":

Experts believe that this implies Isis is using encryption software to send messages which would be difficult for security services to intercept and decrypt. The use of disposable phones (most of which were not even connected to email accounts) and refusal to use any method of communication for long show that the network operating out of Brussels is aware that silence is the best defence. If no communication is sent, none can be intercepted. 

From this, we can take two things: first, that panic over the encryption of Whatsapp messages or mainstream websites is misplaced. And second, that western Isis cells seem to be far ahead of our security services in terms of their communication tactics.