A new public beta of Zfone has been released a few days ago for windows xp, linux and mac os x. Zfone uses a new protocol called ZRTP, which is better than the other approaches to secure VoIP. “(ZRTP) achieves security without reliance on a PKI (Public Key Infrastructure), key certification, trust models, certificate authorities, or key management complexity that bedevils the email encryption world,” Zimmermann explains.
Zfone works with VOIP software like Gizmo and SIPphone but not with the popular Skype. “Skype uses a closed proprietary protocol, which they (the developers) do not publish”. Head to the developers webpage to read more about the new tool of the creator of the PGP standard.
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