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Kashmiri demonstrators hold up a flag of the Islamic State of Iraq and the Levant (ISIL) during a demonstration against Israeli military operations in Gaza, in downtown Srinagar on July 18, 2014.
Kashmiri demonstrators hold up a flag of the Islamic State of Iraq and the Levant (ISIL) during a demonstration against Israeli military operations in Gaza, in downtown Srinagar on July 18, 2014.

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    ISIS used encryption to hide

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ISIS used encryption to hide

As the hunt for possible suspects in the Paris attacks continue, officials say ISIS is using encrypted communications to foil intelligence agencies. CNN's Brian Todd reports.

ISIS used encryption to hide

As the hunt for possible suspects in the Paris attacks continue, officials say ISIS is using encrypted communications to foil intelligence agencies. CNN's Brian Todd reports.