Security News > 2015 > November > Paris Terrorists Use Double ROT-13 Encryption (Schneier on Security)

That is, no encryption at all. The Intercept has the story: "Yet news emerging from Paris -- as well as evidence from a Belgian ISIS raid in January -- suggests that the ISIS terror networks involved were communicating in the clear, and that the data on their smartphones was not encrypted. European media outlets are reporting that the location of...

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https://www.schneier.com/blog/archives/2015/11/paris_terrorist.html