Encryption of Header Extensions in the Secure Real-Time Transport Protocol (SRTP)
draft-ietf-avtcore-srtp-encrypted-header-ext-02

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Document Type Active Internet-Draft (avtcore WG)
Last updated 2012-07-16
Replaces draft-lennox-avtcore-srtp-encrypted-header-ext
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AVTCORE                                                        J. Lennox
Internet-Draft                                                     Vidyo
Updates: 3711 (if approved)                                July 16, 2012
Intended status: Standards Track
Expires: January 17, 2013

   Encryption of Header Extensions in the Secure Real-Time Transport
                            Protocol (SRTP)
            draft-ietf-avtcore-srtp-encrypted-header-ext-02

Abstract

   The Secure Real-Time Transport Protocol (SRTP) provides
   authentication, but not encryption, of the headers of Real-Time
   Transport Protocol (RTP) packets.  However, RTP header extensions may
   carry sensitive information for which participants in multimedia
   sessions want confidentiality.  This document provides a mechanism,
   extending the mechanisms of SRTP, to selectively encrypt RTP header
   extensions in SRTP.

   This document updates RFC 3711, the Secure Real-Time Transport
   Protocol specification, to require that all SRTP encryption
   transforms specify how RTP header extensions are to be encrypted.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 17, 2013.

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

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   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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Encryption Mechanism . . . . . . . . . . . . . . . . . . . . .  4
     3.1.  Example Encryption Mask  . . . . . . . . . . . . . . . . .  5
     3.2.  Header Extension Keystream Generation for Existing
           Encryption Transforms  . . . . . . . . . . . . . . . . . .  6
     3.3.  Header Extension Keystream Generation for Future
           Encryption Transforms  . . . . . . . . . . . . . . . . . .  7
   4.  Signaling (Setup) Information  . . . . . . . . . . . . . . . .  7
     4.1.  Backward compatibility . . . . . . . . . . . . . . . . . .  8
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 10
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 10
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   Appendix A.  Test Vectors  . . . . . . . . . . . . . . . . . . . . 11
     A.1.  Key derivation test vectors  . . . . . . . . . . . . . . . 11
     A.2.  Header Encryption Test Vectors using AES-CM  . . . . . . . 12
   Appendix B.  Changes From Earlier Versions . . . . . . . . . . . . 13
     B.1.  Changes from draft-ietf-avtcore -01  . . . . . . . . . . . 13
     B.2.  Changes from draft-ietf-avtcore -00  . . . . . . . . . . . 14
     B.3.  Changes from draft-lennox-avtcore -00  . . . . . . . . . . 14
     B.4.  Changes from draft-lennox-avt -02  . . . . . . . . . . . . 15
     B.5.  Changes From Individual Submission Draft -01 . . . . . . . 15
     B.6.  Changes From Individual Submission Draft -00 . . . . . . . 15
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 15

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1.  Introduction
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