signal app
open whisper system is the company
download from the NPR Marketplace Tech available here:
http://play.podtrac.com/APM-MarketplaceTechReport/play.publicradio.org/rss/d/podcast/marketplace/tech_report/2016/11/16/tech_20161116_pod_64.mp3?siteplayer=true&dl=1

More on the app in the Codebreaker podcast

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more on cybersecurity in this blog:
https://blog.stcloudstate.edu/ims?s=cybersecurity
More on civil disobedience in this blog:
https://blog.stcloudstate.edu/ims?s=civil