ZRTP (Zimmermann Real-Time Transport Protocol)
ZRTP is a voice over IP (VoIP) encryption extension for the Real-Time Transport Protocol (RTP).
The "Z" in "ZRTP" is the first letter of the surname of Phil Zimmermann, an engineer best known for
inventing Pretty Good Privacy (PGP). ZRTP is a part of a software developer's kit (SDK) for an
encryption program Zimmerman created called Zfone. It allows the user to encrypt any Session
Initiation Protocol (SIP) VoIP voice
stream, as long as the other person on the call is also using Zfone.
This was last updated in August 2006
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