A set-key attribute for symmetric-key packages
draft-herzog-setkey-05

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Network Working Group                                          J. Herzog
Internet-Draft                                                 R. Khazan
Intended status: Experimental                     MIT Lincoln Laboratory
Expires: August 31, 2012                               February 28, 2012

             A set-key attribute for symmetric-key packages
                         draft-herzog-setkey-05

Abstract

   A set-key is a symmetric key (or set of keys) associated with an
   immutable set of participants.  This document defines a set-key
   attribute for use in the CMS-based symmetric-key package structure
   [RFC6031].

Disclaimer

   This work is sponsored by the United States Air Force under Air Force
   Contract FA8721-05-C-0002.  Opinions, interpretations, conclusions
   and recommendations are those of the authors and are not necessarily
   endorsed by the United States Government.

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   Copyright (c) 2012 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Set-keys . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  Symmetric key packages . . . . . . . . . . . . . . . . . .  4
     1.3.  Intended Usage . . . . . . . . . . . . . . . . . . . . . .  5
     1.4.  Requirements Terminology . . . . . . . . . . . . . . . . .  5
   2.  The set-key attribute  . . . . . . . . . . . . . . . . . . . .  5
   3.  Attribute generation . . . . . . . . . . . . . . . . . . . . .  9
   4.  Attribute processing . . . . . . . . . . . . . . . . . . . . . 12
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 16
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 17
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 17
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 18
   Appendix A.  ASN.1 Module  . . . . . . . . . . . . . . . . . . . . 18
   Appendix B.  ASN.1 structures for Attributes . . . . . . . . . . . 19
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 20

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1.  Introduction

   This document defines a new set-key attribute for use in the
   symmetric-key package structure defined in [RFC6031].

1.1.  Set-keys

   A 'set-key' is a symmetric key associated with (and to be limited to)
   a specific set of participants (entities).  The exact definition of
   'participant', in the context of a particular key, will depend on the
   key's intended application.  Roughly speaking, however, the set of
   participants corresponds to the collection of individual agents which
   must possess and use the key for the key's intended purpose.  In
   practice, a 'participant' will often be an entity with a certified
   public key, but other definitions of 'participant' are possible.

   A set-key can be used in many ways, including:

   o  To secure broadcast or multicasts of e.g., pay-per-view movies,

   o  To secure group-communication such as chat rooms, or

   o  To secure data-at-rest which belongs to a group (such as on an
      encrypted file-system or on a server).

   The only requirement of a set-key is that it be associated with a