As the NSA leaks create new demand for secure voice and texting apps, it’s a lesson developers have learned over and over. When it comes to tackling that problem, Whisper Systems has an unusually strong track record. Its called Signal, a free iOS app aiming for the simplest and easiest encrypted call youll ever make. The process will be familiar to RedPhone users, but the interface here is more polished, adopting the flat look of iOS 7 and 8.
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