Silent Text: Basic Anonymity at a Hefty Price

The Tibetan government, law firms in Thailand and human rights groups in Sudan are all using a relatively new encrypted communications tool — one that fits easily, if not cheaply, onto your smartphone. Silent Circle is an encrypted voice, video, text and file-transfer protocol that’s available in app forms for Android devices, among others. The voice or phone app uses the ZRTP key agreement protocol designed by the creator of PGP, or Pretty Good Privacy.

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