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Guidelines for the Use of Variable Bit Rate Audio with Secure RTP (RFC6562)

IP.com Disclosure Number: IPCOM000215827D
Original Publication Date: 2012-Mar-01
Included in the Prior Art Database: 2012-Mar-13
Document File: 12 page(s) / 14K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Perkins: AUTHOR [+2]

Abstract

The Secure RTP (SRTP) framework [RFC3711] is a widely used framework for securing RTP sessions [RFC3550]. SRTP provides the ability to encrypt the payload of an RTP packet, and optionally add an authentication tag, while leaving the RTP header and any header extension in the clear. A range of encryption transforms can be used with SRTP, but none of the predefined encryption transforms use any padding; the RTP and SRTP payload sizes match exactly.

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Internet Engineering Task Force (IETF)                        C. Perkins Request for Comments: 6562                         University of Glasgow Category: Standards Track                                      JM. Valin ISSN: 2070-1721                                      Mozilla Corporation                                                               March 2012

                       Guidelines for the Use of                 Variable Bit Rate Audio with Secure RTP

Abstract

   This memo discusses potential security issues that arise when using    variable bit rate (VBR) audio with the secure RTP profile.    Guidelines to mitigate these issues are suggested.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc6562.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    (http://trustee.ietf.org/license-info) in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

 Perkins & Valin              Standards Track                    [Page 1]
 RFC 6562                   VBR Audio with SRTP                March 2012

 Table of Contents

   1.  Introduction ...................................................2    2.  Scenario-Dependent Risk ........................................2    3.  Guidelines for Use of VBR Audio with SRTP ......................3    4.  Guidelines for Use of Voice Activity Detection with SRTP .......3    5.  Padding the Output of VBR Codecs ...............................4    6.  Security Considerations ........................................5    7.  Acknowledgements ................................................