SAN JUAN, Puerto Rico--Phil Zimmermann has seen more changes in the the threat landscape in his career than he may care to remember. The inventor of the PGP encryption software and one of the key movers in the crypto wars of the early 1990s, Zimmermann is back in the game now with a new mobile crypto system that's designed to help take the prospect of government eavesdropping and criminal attacks on mobile communications off the table.
The new venture, Silent Circle, launched last year and was conceived with the idea of giving people in hostile situations a reliably secure communications mechanism, even if they think they may be under active surveillance. Users of the iPhone or Android app can conduct secure, encrypted voice calls with other users. The system relies on an encryption scheme that doesn't use the public-key infrastructure, something that Zimmermann was adamant about.
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