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Security Descriptions Extension for Media Streams (draft-zhou-mmusic-sdes-keymod-00)

Security Descriptions Extension for Media Streams (draft-zhou-mmusic-sdes-keymod-00). S. Zhou ， T. Tian , Z. Xie IETF 83-mmusic , 2012-3. 1. Background and Proposal . Motivation ：

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Security Descriptions Extension for Media Streams (draft-zhou-mmusic-sdes-keymod-00)

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  1. Security Descriptions Extension for Media Streams(draft-zhou-mmusic-sdes-keymod-00) S. Zhou， T. Tian, Z. Xie IETF 83-mmusic , 2012-3 1

  2. Background and Proposal • Motivation： • In forking and re-targeting scenarios, offerer sends outgoing keying material to the ultimate answerer, as well as intermediate users/devices • An UPDATE/Re-INVITE can send a new keying material to the ultimate answerer  an extra round trip messages • Proposal • a new session parameter extension "keymod" to extend SDP Security Description (RFC 4568) srtp-session-extension = keymod keymod = "keymod:" <keymod-info> keymod-info = <keymod-type> "|"<kdf-func>"|"<keymod- val> keymod-type = "rand"/"rand-salt"/keymod-type-ext keymod-type-ext = 1*(VCHAR) kdf-func = 1*(ALPHA / DIGIT / "_") // “is” “xor” keymod-val =*(base64);base64 encoded binary string • Defined in 3GPP TR 33.829 V0.0.9 (2011-12) • 9.3.1.3 SDES solution 2 2

  3. Application in Some Scenarios Re-targeting scenario Forking scenario  3

  4. Next Steps • Improvements based on comments • Ask for adoption as WG item Thanks! 4

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