The extremist group [ISIS] has also apparently learned to keep secrets off the grid and to limit who knows what—techniques long used by al Qaeda, which favors messengers and handwritten notes," it adds.
Jihadists are becoming distrustful of various forms of communication, keeping themselves from sharing..."
http://www.breitbart.com/national-security/2016/09/14/islamic-state-communications-evolved-harder-track/
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