Friday, March 17, 2006

Zfone, encrypted VoIP from the makers of PGP

Philip Zimmerman, well known amongst the security savvy users for the renowned encryption software PGP (Pretty Good Privacy), just released a public beta version (currently for Mac OS X and Linux: the XP version will be released in April) of Zfone, a VoIP software based on a new protocol called ZRTP, which has some nice cryptographic features lacking in many other approaches to VoIP encryption.ZPhone currently works as an addon to your VoIP client, adding a new layer of security to VoIP calls:
The current Zfone software runs in the Internet Protocol stack on any Windows XP, Mac OS X, or Linux PC, and intercepts and filters all the VoIP packets as they go in and out of the machine, and secures the call on the fly. You can use a variety of different software VoIP clients to make a VoIP call. The Zfone software detects when the call starts, and initiates a cryptographic key agreement between the two parties, and then proceeds to encrypt and decrypt the voice packets on the fly. It has its own little separate GUI, telling the user if the call is secure.

In the future, Zimmerman plans to integrate Zfone into a dedicated and standalone VoIP client.


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