|Scenario Task Description=Messaging is the most popular method for communicating on smartphones today. [https://www.whatsapp.com/ WhatsApp], [https://www.snapchat.com/ SnapChat], [https://slack.com/ Slack] just to name a few, and of course the behemoths that is [https://www.facebook.com/mobile/messenger Facebook messenger] and [http://www.google.com/+/learnmore/hangouts/ Google's Hangouts] all offer messaging servuces. Its interesting to note that they are all working in silos - your friends and contacts need to use the save provider as there is no inter-service communications. In general, they are not considered private since the provider has access to your messages.
Messaging apps that perform [https://en.wikipedia.org/wiki/End-to-end_encryption end-to-end encryption] and publish their methods and source code in the public domain are considered here as private messaging tools. You can see a review of multiple apps on [https://www.eff.org/secure-messaging-scorecard EFF's secure messaging scorecard].
*TextSecure and Silent apps for Android and iPhone respectively from [https://whispersystems.org/ WhisperSystem]. Users of both apps can communicate with each other
*[https://www.surespot.me SureSpot] for Android and iPhone
*[https://www.silentcircle.com/products-and-solutions/software/ SilentPhone] commercial solution from Silent Circle
*[http://www.bleep.pm/ Bleep] is an encrypted peer-to-peer chat infrastructure using Bittorent.
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