Want to keep your text and voice chats truly private, the way NSA whistleblower Edward Snowden does? You'll want to try Open Whisper Systems' Signal for Android, then. The newly launched, Snowden-approved app merges OWS' existing RedPhone and TextSecure products into a single client -- you can communicate over an end-to-end encrypted connection without having to switch apps as you switch formats. The code is open source, too, so you can verify that there aren't any government back doors. It's really just an amalgam of features you've seen before, but it could make a big difference if you're determined to keep your conversations away from prying eyes.
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Snowden's favorite secure chat services unite in one Android app