Tracking Islamic State Plots Impeded by Encryption, Clapper Says

  • DNI chief calls group `most sophisticated' user of scrambling
  • Officials must `thread the needle' on privacy versus security

James Clapper.

Photographer: Samuel Corum/Anadolu Agency/Getty Images

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.

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