RFC - 4771

Integrity Transform Carrying Roll-Over Counter for the Secure Real-time Transport Protocol (SRTP)

Original:	ftp://ftp.isi.edu/in-notes/rfc4771.txt
Authors:	V. Lehtovirta [Ericsson], M. Naslund [Ericsson], K. Norrman [Ericsson]
Date:	January 2007
Category:	Proposed Standard

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Referred by:	0 RFC
Refers to:	3 RFC

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Status

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The IETF Trust (2007).

Abstract

This document defines an integrity transform for Secure Real-time Transport Protocol (SRTP; see RFC 3711), which allows the roll-over counter (ROC) to be transmitted in SRTP packets as part of the authentication tag. The need for sending the ROC in SRTP packets arises in situations where the receiver joins an ongoing SRTP session and needs to quickly and robustly synchronize. The mechanism also enhances SRTP operation in cases where there is a risk of losing sender-receiver synchronization.

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