(Bloomberg) -- Islamic State is "very security-conscious" and a prolific user of strong encryption technology, posing a major challenge as the U.S. works to uncover and disrupt plots by the terrorist group, Director of National Intelligence James Clapper said.
Clapper said the group uses end-to-end encryption, which refers to messaging applications or other services that secure communications when they are sent and received with scrambled code that can be unlocked only with a special key.
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