CNN CNN Newsroom With Carol Costello December 11, 2015 15:30:00
Tutorials telling them how to hide themselves online. >> they provide pretty sophisticated guidelines on what kind of technology to use, what to talk about, how not to get their communications intercepted. >> reporter: encryption texts are out of the show "homeland." matthew green from johns hopkins showed us one way they can disappear on the app. they can self-destruct in a few seconds. i send green a message. he reads it. >> just like that you've got no record of the communication. >> reporter: what about encrypted plotting in san bernardino or paris? regarding san bernardino, there is no ev...
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