MIKEY-TICKET: Ticket-Based Modes of Key Distribution in Multimedia Internet KEYing (MIKEY)
RFC 6043

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Internet Engineering Task Force (IETF)                       J. Mattsson
Request for Comments: 6043                                      Ericsson
Category: Informational                                          T. Tian
ISSN: 2070-1721                                                      ZTE
                                                              March 2011

          MIKEY-TICKET: Ticket-Based Modes of Key Distribution
                 in Multimedia Internet KEYing (MIKEY)

Abstract

   The Multimedia Internet KEYing (MIKEY) specification describes a key
   management scheme for real-time applications.  In this document, we
   note that the currently defined MIKEY modes are insufficient to
   address deployment scenarios built around a centralized key
   management service.  Interest in such deployments is increasing.
   Therefore, a set of new MIKEY modes that work well in such scenarios
   are defined.  The new modes use a trusted key management service and
   a ticket concept, similar to that in Kerberos.  The new modes also
   support features used by many existing applications, where the exact
   identity of the other endpoint may not be known at the start of the
   communication session.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6043.

Mattsson & Tian               Informational                     [Page 1]
RFC 6043                      MIKEY-TICKET                    March 2011

Copyright Notice

   Copyright (c) 2011 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
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   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 ....................................................4
   2. Terminology .....................................................4
      2.1. Definitions and Notation ...................................5
      2.2. Abbreviations ..............................................6
      2.3. Payloads ...................................................6
   3. Design Considerations ...........................................7
   4. MIKEY-TICKET ....................................................9
      4.1. Overview ...................................................9
           4.1.1. Modes ..............................................12
      4.2. Exchanges .................................................13
           4.2.1. Ticket Request .....................................13
           4.2.2. Ticket Transfer ....................................16
           4.2.3. Ticket Resolve .....................................19
   5. Key Management Functions .......................................23
      5.1. Key Derivation ............................................23
           5.1.1. Deriving Forked Keys ...............................25
           5.1.2. Deriving Keys from an Envelope Key/PSK/MPK .........26
           5.1.3. Deriving Keys from a TGK/GTGK ......................27
      5.2. CSB Updating ..............................................28
      5.3. Ticket Reuse ..............................................29
      5.4. Error Handling ............................................29
      5.5. MAC/Signature Coverage ....................................30
   6. Payload Encoding ...............................................31
      6.1. Common Header Payload (HDR) ...............................31
           6.1.1. The GENERIC-ID Map Type ............................33
      6.2. Key Data Transport Payload (KEMAC) ........................34
           6.2.1. Key Data Sub-Payload ...............................35
      6.3. Timestamp Payload (T) .....................................36
      6.4. Timestamp Payload with Role Indicator (TR) ................36
      6.5. ID Payload (ID) ...........................................37
      6.6. ID Payload with Role Indicator (IDR) ......................37