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IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-011 Dan Wing, MSEC Working Group DTLS-SRTP Key Transport.

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Presentation on theme: "IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-011 Dan Wing, MSEC Working Group DTLS-SRTP Key Transport."— Presentation transcript:

1 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-011 Dan Wing, dwing@cisco.com MSEC Working Group DTLS-SRTP Key Transport

2 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-012 Overview IETF68 (Prague), RTPSEC BoF selected DTLS-SRTP as the preferred SRTP keying mechanism Only unicast, point-to-point was in scope DTLS-SRTP Key Transport allows efficient SRTP operation for –Several unicast conferencing scenarios –Multicast

3 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-013 Why Consider DTLS-SRTP for Multicast? DTLS-SRTP works for group of 2 GDOI-SRTP is overkill for a group of 3 –Useful for a larger group DTLS-SRTP-Key-Transport allows optimizing SRTP keying for small groups

4 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-014 Operation of DTLS-SRTP Key Transport for Multicast

5 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-015 DTLS-SRTP-Key-Transport DTLS-SRTP-Key-Transport is negotiated during TLS handshake DTLS-SRTP session stays up for duration of call SRTP key is sent within the DTLS session itself –As a new TLS content-type

6 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-016 DTLS session with each listener 1.Each listener establishes unicast DTLS- SRTP session with speaker 2.Speaker uses DTLS-SRTP Key Transport to tell every listener the same SRTP key speaker Listener 1 Listener 2 Listener 3 DTLS-SRTP, transport speakers SRTP key A

7 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-017 SRTP multicasting SRTP packets are then multicasted to listeners speaker Listener 1 Listener 2 Listener 3 SRTP packet, key A

8 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-018 DTLS-SRTP-Key-Transport DTLS-SRTP-Key-Transport is negotiated during TLS handshake DTLS-SRTP session stays up for duration of call SRTP key is sent within the DTLS session itself –As a new TLS content-type

9 IETF71, Philadelphia, March 2008draft-wing-avt-dtls-srtp-key-transport-019 Questions draft-wing-avt-dtls-srtp-key-transport-01 Dan Wing, dwing@cisco.com


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