FBI: Terrorists hiding with impenetrable communication

Aired: 11/18/2015 | 0:03:00 | Clip
How did the Paris terrorists communicate with each other and elude surveillance? Investigators are eyeing readily available cellphone technologies that defy cracking by intelligence agencies and even the companies that created them. Judy Woodruff takes a look at some of the encrypted apps and software being used to evade detection.

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