AES-GCM Authenticated Encryption in Secure RTP (SRTP)
draft-ietf-avtcore-srtp-aes-gcm-15

 
Document Type Active Internet-Draft (avtcore WG)
Last updated 2015-04-14
Replaces draft-ietf-avt-srtp-aes-gcm
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication Sep 2013
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Document shepherd Magnus Westerlund
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IESG IESG state IESG Evaluation::AD Followup
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Responsible AD Ben Campbell
Send notices to avtcore-chairs@ietf.org, draft-ietf-avtcore-srtp-aes-gcm@ietf.org, "Magnus Westerlund" <magnus.westerlund@ericsson.com>
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Network Working Group                                          D. McGrew
Internet Draft                                       Cisco Systems, Inc.
Intended Status: Standards Track                                 K. Igoe
Expires: October 16, 2015                       National Security Agency
                                                          April 14, 2015

          AES-GCM Authenticated Encryption in Secure RTP (SRTP)         
                   draft-ietf-avtcore-srtp-aes-gcm-15                   

Status of this Memo

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   This Internet-Draft will expire on October 16, 2015.

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Igoe and McGrew                 Standards Track                 [Page 1]
Internet Draft               AES-GCM for SRTP               Apr 14, 2015

Abstract

   This document defines how the AES-GCM Authenticated Encryption with
   Associated Data family of algorithms can be used to provide
   confidentiality and data authentication in the SRTP protocol.  Note:
   this is an intermediate draft, awaiting the inclusion of test
   vectors.  Care is being taken to ensure these test vectors will be
   correct, always a desirable property. 
 

Table of Contents

   1. Introduction.....................................................3
   2. Conventions Used In This Document................................4
   3. Overview of the SRTP/SRTCP AEAD security Architecture............4
   4. Terminology......................................................5
   5. Generic AEAD Processing..........................................5
      5.1. Types of Input Data.........................................5
      5.2. AEAD Invocation Inputs and Outputs..........................5
         5.2.1. Encrypt Mode...........................................5
         5.2.2. Decrypt Mode...........................................6
      5.3. Handling of AEAD Authentication.............................6
   6. Counter Mode Encryption..........................................6
   7. Unneeded SRTP/SRTCP Fields.......................................7
      7.1. SRTP/SRTCP Authentication Field.............................7
      7.2. RTP Padding.................................................8
   8. AES-GCM processing for SRTP......................................8
      8.1. SRTP IV formation for AES-GCM...............................8
      8.2. Data Types in SRTP Packets..................................8
      8.3. Handling Header Extensions.................................10
      8.4. Prevention of SRTP IV Reuse................................11
   9. AES-GCM Processing of SRTCP Compound Packets....................12
      9.1. SRTCP IV formation for AES-GCM.............................12
      9.2. Data Types in Encrypted SRTCP Compound Packets.............13
      9.3. Data Types in Unencrypted SRTCP Compound Packets...........14
      9.4. Prevention of SRTCP IV Reuse...............................15
   10. Constraints on AEAD for SRTP and SRTCP.........................15
   11. Key Derivation Functions.......................................16
   12. Summary of AES-GCM in SRTP/SRTCP...............................16
   13. Security Considerations........................................17
      13.1. Handling of Security Critical Parameters..................18
      13.2. Size of the Authentication Tag............................18
   14. IANA Considerations............................................19
      14.1. SDES......................................................19
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