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added reference to Phil Zimmermann /psa

git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@3402 4b5297f7-1745-476d-ba37-a9c6900126ab
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Unknown User 2009-09-10 01:49:59 +00:00
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</header>
<section1 topic='Protocol' anchor='protocol'>
<p>&xep0167; recommends the use of the Secure Real-time Transport Protocol (SRTP) for end-to-end encryption of RTP sessions negotiated using &xep0166;. An alternative approach to end-to-end encryption of RTP traffic is provided by &zrtp;. Although negotiation of ZRTP mainly occurs in the media channel rather than the signalling channel, the ZRTP specification defines one SDP attribute called "zrtp-hash" (this communicates the ZRTP version supported as well as a hash of the Hello message).</p>
<p>&xep0167; recommends the use of the Secure Real-time Transport Protocol (SRTP) for end-to-end encryption of RTP sessions negotiated using &xep0166;. An alternative approach to end-to-end encryption of RTP traffic is provided by &zrtp;, developed by Phil Zimmermann, the inventor of "Pretty Good Privacy" (PGP). Although negotiation of ZRTP mainly occurs in the media channel rather than the signalling channel, the ZRTP specification defines one SDP attribute called "zrtp-hash" (this communicates the ZRTP version supported as well as a hash of the Hello message).</p>
<p>The SDP format is shown below.</p>
<code>
a=zrtp-hash:zrtp-version zrtp-hash-value