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Status:

INFORMATIONAL

Authors:

P. Zimmermann
A. Johnston, Ed.
J. Callas

Stream:

IETF

Source:

NON WORKING GROUP

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DOI:  https://doi.org/10.17487/RFC6189

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Abstract

This document defines ZRTP, a protocol for media path Diffie-Hellmanexchange to agree on a session key and parameters for establishingunicast Secure Real-time Transport Protocol (SRTP) sessions for Voiceover IP (VoIP) applications. The ZRTP protocol is media path keyingbecause it is multiplexed on the same port as RTP and does notrequire support in the signaling protocol. ZRTP does not assume aPublic Key Infrastructure (PKI) or require the complexity ofcertificates in end devices. For the media session, ZRTP providesconfidentiality, protection against man-in-the-middle (MiTM) attacks,and, in cases where the signaling protocol provides end-to-endintegrity protection, authentication. ZRTP can utilize a SessionDescription Protocol (SDP) attribute to provide discovery andauthentication through the signaling channel. To provide best effortSRTP, ZRTP utilizes normal RTP/AVP (Audio-Visual Profile) profiles.ZRTP secures media sessions that include a voice media stream and canalso secure media sessions that do not include voice by using anoptional digital signature. This document is not an Internet Standards Track specification; it is published for informational purposes.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.