I-D Action:draft-zimmermann-avt-zrtp-05.txt

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	Title           : ZRTP: Media Path Key Agreement for Secure RTP
	Author(s)       : P. Zimmermann, et al.
	Filename        : draft-zimmermann-avt-zrtp-05.txt
	Pages           : 79
	Date            : 2008-02-25

This document defines ZRTP, a protocol for media path Diffie-Hellman
exchange to agree on a session key and parameters for establishing
Secure Real-time Transport Protocol (SRTP) sessions.  The ZRTP
protocol is media path keying because it is multiplexed on the same
port as RTP and does not require support in the signaling protocol.
ZRTP does not assume a Public Key Infrastructure (PKI) or require the
complexity of certificates in end devices.  For the media session,
ZRTP provides confidentiality, protection against man-in-the-middle
(MITM) attacks, and, in cases where a secret is available from the
signaling protocol, authentication.  ZRTP can utilize two Session
Description Protocol (SDP) attributes to provide discovery and
authentication through the signaling channel.  To provide best effort
SRTP, ZRTP utilizes normal RTP/AVP profiles.

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