Integrity Transform Carrying Roll-Over Counter for the Secure Real-time Transport Protocol (SRTP)
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From: The IESG <firstname.lastname@example.org> To: IETF-Announce <email@example.com> Cc: Internet Architecture Board <firstname.lastname@example.org>, RFC Editor <email@example.com> Subject: Protocol Action: 'Integrity Transform Carrying Roll-over Counter' to Proposed Standard The IESG has approved the following document: - 'Integrity Transform Carrying Roll-over Counter ' <draft-lehtovirta-srtp-rcc-07.txt> as a Proposed Standard This document has been reviewed in the IETF but is not the product of an IETF Working Group. The IESG contact person is Russ Housley. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-lehtovirta-srtp-rcc-07.txt
Technical Summary This specification defines an integrity transform for SRTP so the roll-over counter (RoC) can be carried in SRTP packets as part of the authentication tag. This allows late-joining receivers to easily synchronize with the sender. Other mechanisms include estimating the RoC, which is not as robust as actually carrying the RoC in the packets. The RoC is carried in every rth packet, which is bandwidth- sensitive. Other alternative solutions might be to use RTCP for RoC synchronization. At the moment, 3GPP, 3GPP2 and other broadcast systems do not specify the use of RTCP and hence the RTP-based solution specified in this document is more useful. Working Group Summary This is not a WG document. The notion of additional data transport in RTP was discussed on RTPsec mail list. Protocol Quality Once this is published, OMA BCAST and 3GPP MBMS compliant systems may use this feature. This document was reviewed by Russ Housley for the IESG.