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May 24, 2006

If you're eager to converse without Uncle Sam listening in, PGP creator Philip Zimmermann has released a new free beta of software that will encrypt VoIP calls. Dubbed Zfone, the software uses Diffie-Hellman to generate a per-session key for VoIP calls using the new ZRTP protocol Zimmermann proclaims is better than alternatives.
"better than the other approaches to secure VoIP, because it achieves security without reliance on a PKI, key certification, trust models, certificate authorities, or key management complexity that bedevils the email encryption world. It also does not rely on SIP signaling for the key management, and in fact does not rely on any servers at all. It performs its key agreements and key management in a purely peer-to-peer manner over the RTP packet stream. It interoperates with any standard SIP phone, but naturally only encrypts the call if you are calling another ZRTP client."
The software is free, and available for Mac OS-X, Linux, and Windows XP. Of course it won't work with Skype and other popular solutions, so you'll have to run a softphone like X-Lite, Gizmo, or SJphone as per the FAQ.