CNN Situation Room With Wolf Blitzer November 17, 2015 22:19:00
Mathematical algorithms, code that u.s. officials say nearly impossible to crack. >> we don't have the break strong encryption. we will lose them, so that's a huge worry. >> reporter: apps like one called signal encrypt phone calls. telegram encrypt text. matthew green showed us another way terrorists can make their texts disappear on the telegram app. you can program them to self-destruct in a few seconds. i sent green a text to meet me somewhere. he reads it, then -- >> gone. just like that, you got no record of the communication. >> reporter: telegram has an avenue, similar to facebook and ...
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