MIKEY-SAKKE: Sakai-Kasahara Key Encryption in Multimedia Internet KEYing (MIKEY)
RFC 6509

Internet Engineering Task Force (IETF)                         M. Groves
Request for Comments: 6509                                          CESG
Category: Informational                                    February 2012
ISSN: 2070-1721

             MIKEY-SAKKE: Sakai-Kasahara Key Encryption in
                   Multimedia Internet KEYing (MIKEY)

Abstract

   This document describes the Multimedia Internet KEYing-Sakai-Kasahara
   Key Encryption (MIKEY-SAKKE), a method of key exchange that uses
   Identity-based Public Key Cryptography (IDPKC) to establish a shared
   secret value and certificateless signatures to provide source
   authentication.  MIKEY-SAKKE has a number of desirable features,
   including simplex transmission, scalability, low-latency call setup,
   and support for secure deferred delivery.

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 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/rfc6509.

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.

M. Groves                     Informational                     [Page 1]
RFC 6509                       MIKEY-SAKKE                 February 2012

Table of Contents

   1. Introduction ....................................................3
      1.1. Requirements Terminology ...................................3
   2. A New MIKEY Mode: MIKEY-SAKKE ...................................4
      2.1. Outline ....................................................4
           2.1.1. Parameters ..........................................5
           2.1.2. Key Types ...........................................5
      2.2. Preparing and Processing MIKEY-SAKKE Messages ..............6
           2.2.1. Components of the I_MESSAGE .........................6
           2.2.2. Processing the I_MESSAGE ............................7
      2.3. Forking and Retargeting ....................................8
      2.4. Group Communications .......................................9
      2.5. Deferred Delivery ..........................................9
   3. Key Management ..................................................9
      3.1. Generating Keys from the Shared Secret Value ...............9
      3.2. Identifiers ...............................................10
      3.3. Key Longevity and Update ..................................11
      3.4. Key Delivery ..............................................12
   4. Payload Encoding ...............................................12
      4.1. Common Header Payload (HDR) ...............................12
      4.2. SAKKE Payload .............................................13
      4.3. SIGN Payload ..............................................14
      4.4. IDR Payload ...............................................14
   5. Applicability of MIKEY-SAKKE Mode ..............................14
   6. Security Considerations ........................................14
      6.1. Forking ...................................................15
      6.2. Retargeting ...............................................16
      6.3. Group Calls ...............................................16
      6.4. Deferred Delivery .........................................16
   7. IANA Considerations ............................................16
   8. References .....................................................17
      8.1. Normative References ......................................17
      8.2. Informative References ....................................18
   Appendix A. Parameters for Use in MIKEY-SAKKE......................20

M. Groves                     Informational                     [Page 2]
RFC 6509                       MIKEY-SAKKE                 February 2012