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Key Management Extensions for SDP and RTSP <draft-ietf-mmusic-kmgmt-ext-00.txt> - PowerPoint PPT Presentation


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Key Management Extensions for SDP and RTSP <draft-ietf-mmusic-kmgmt-ext-00.txt>. Background. Draft “Key Management for Multimedia Sessions” at the 51st IETF Work split between MSEC WG an MMUSIC WG Extensions to SDP and RTSP in MMUSIC WG

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Key Management Extensions for SDP and RTSP <draft-ietf-mmusic-kmgmt-ext-00.txt>


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    1. Key Management Extensions for SDP and RTSP <draft-ietf-mmusic-kmgmt-ext-00.txt>

    2. Background • Draft “Key Management for Multimedia Sessions” at the 51st IETF • Work split between MSEC WG an MMUSIC WG • Extensions to SDP and RTSP in MMUSIC WG • Security part in MSEC WG (“MIKEY: Multimedia Internet KEYing”, draft-ietf-msec-mikey-00.txt)

    3. Bob Scenarios SIP call RTSP Alice Network

    4. Extensions • MUST support a 1-roundtrip protocol • Created to have a small impact on current SDP, RTSP, and SIP implementations • Let the key management protocol do the work of parsing etc!

    5. SDP extensions • Three new attributes a=keymgmt-prot:<protocol name> e.g. MIKEY a=keymgmt-data:<data> the actual key management data (base64-encoded recommended) a=keymgmt-auth:<auth-data> extended authentication data

    6. SDP example a=keymgmt-prot:MIKEY a=keymgmt-data:uiSDF9sdhs727ghsd/dhsoKkdOokdo7eWsnDSJD... m=audio 49000 RTP/SAVP 98 a=rtpmap:98 AMR/8000 m=video 2232 RTP/SAVP 31 m=audio 49000 RTP/AVP 98 a=rtpmap:98 AMR/8000 m=video 2232 RTP/SAVP 31 a=keymgmt-prot:MIKEY a=keymgmt-data:uiSDF9sdhs727ghsd/dhsoKkdOokdo7eWsnDSJD... Applies to all streams Applies to one stream

    7. RTSP extensions • One new header • use in ANNOUNCE, SETUP, PLAY, RECORD, SET_PARAMETER, GET_PARAMETER, OPTIONS KeyMgmt = "KeyMgmt" ":" [stream-url] protocol data [auth] stream-url = "url" "=" url ";" protocol = "Prot" "=" prtcl-name data = ";" "Data" "=" string auth = ";" "Auth" "=" string string = 1*(alpha-numeric|SAFE|"=")

    8. How to use the attributes SIP • SDP in INVITE message + OK message • Re-keying by sending a re-INVITE RTSP • Initial key management message created by server • Sent in SDP (e.g. via response to Describe or via HTTP) • Response, in the new RTSP header (SETUP or PLAY)

    9. The End • Questions and Comments? • How to proceed?