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RFC 6189
Title: ZRTP: Media Path Key Agreement
for Unicast Secure RTP
Author: P. Zimmermann, A. Johnston, Ed.,
J. Callas
Status: Informational
Stream: IETF
Date: April 2011
Mailbox: prz@mit.edu,
alan.b.johnston@gmail.com,
jon@callas.org
Pages: 115
Characters: 293784
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-zimmermann-avt-zrtp-22.txt
URL: http://www.rfc-editor.org/rfc/rfc6189.txt
This document defines ZRTP, a protocol for media path Diffie-Hellman
exchange to agree on a session key and parameters for establishing
unicast Secure Real-time Transport Protocol (SRTP) sessions for Voice
over IP (VoIP) applications. 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 the signaling protocol provides end-to-end
integrity protection, authentication. ZRTP can utilize a Session
Description Protocol (SDP) attribute to provide discovery and
authentication through the signaling channel. To provide best effort
SRTP, ZRTP utilizes normal RTP/AVP (Audio-Visual Profile) profiles.
ZRTP secures media sessions that include a voice media stream and can
also secure media sessions that do not include voice by using an
optional digital signature. This document is not an Internet
Standards Track specification; it is published for informational purposes.
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