Using Pre-Shared Key (PSK) in the Cryptographic Message Syntax (CMS)
draft-housley-cms-mix-with-psk-01

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INTERNET-DRAFT                                                R. Housley
Intended Status: Proposed Standard                        Vigil Security
Expires: 7 June 2018                                     7 December 2017

  Using Pre-Shared Key (PSK) in the Cryptographic Message Syntax (CMS)
                <draft-housley-cms-mix-with-psk-01.txt>

Abstract

   The invention of a large-scale quantum computer would pose a serious
   challenge for the cryptographic algorithms that are widely deployed
   today.  The Cryptographic Message Syntax (CMS) supports key transport
   and key agreement algorithms that could be broken by the invention of
   such a quantum computer.  By storing communications that are
   protected with the CMS today, someone could decrypt them in the
   future when a large-scale quantum computer becomes available.  Once
   quantum-secure key management algorithms are available, the CMS will
   be extended to support them, if current syntax the does not
   accommodated them.  In the near-term, this document describes a
   mechanism to protect today's communication from the future invention
   of a large-scale quantum computer by mixing the output of key
   transport and key agreement algorithms with a pre-shared key.

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
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Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Housley                                                         [Page 1]
INTERNET-DRAFT            Using PSK in the CMS             December 2017

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  ASN.1  . . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.3.  Version Numbers  . . . . . . . . . . . . . . . . . . . . .  3
   2.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  KeyTransPSKRecipientInfo . . . . . . . . . . . . . . . . . . .  5
   4.  KeyAgreePSKRecipientInfo . . . . . . . . . . . . . . . . . . .  6
   5.  ASN.1 Module . . . . . . . . . . . . . . . . . . . . . . . . .  7
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   8.  Normative References . . . . . . . . . . . . . . . . . . . . . 11
   9.  Informative References . . . . . . . . . . . . . . . . . . . . 11
   Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . 12
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.  Introduction

   The invention of a large-scale quantum computer would pose a serious
   challenge for the cryptographic algorithms that are widely deployed
   today.  It is an open question whether or not it is feasible to build
   a large-scale quantum computer, and if so, when that might happen.
   However, if such a quantum computer is invented, many of the
   cryptographic algorithms and the security protocols that use them
   would become vulnerable.

   The Cryptographic Message Syntax (CMS) [RFC5652][RFC5803] supports
   key transport and key agreement algorithms that could be broken by
   the invention of a large-scale quantum computer [C2PQ].  These
   algorithms include RSA [RFC4055], Diffie-Hellman [RFC2631], and
   Elliptic Curve Diffie-Hellman.  As a result, an adversary that stores
   CMS-protected communications today, could decrypt those
   communications in the future when a large-scale quantum computer
   becomes available.

   Once quantum-secure key management algorithms are available, the CMS
   will be extended to support them, if current syntax the does not

Housley                                                         [Page 2]
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