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Increasingly people are becoming rightfully becoming more paranoid about their communications being monitored. Cue Philip Zimmerman of PGP.

PGP is arguably that largest installed base of communication encryption products, but perviously focused on email and Hard Disk encryption. Now he is focusing on VoIP.

What sets Zfone apart from comparable systems is that it does not require a web of computers to hold the keys, or long numbers, used in most encryption schemes. Instead, it performs the key exchange inside the digital voice channel while the call is being set up, so no third party has the keys.

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