Using Pre-Shared Key (PSK) in the Cryptographic Message Syntax (CMS)
draft-housley-cms-mix-with-psk-01
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Russ Housley
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2017-12-07
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RFC 8696, RFC 8696
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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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
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
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
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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]
INTERNET-DRAFT Using PSK in the CMS December 2017
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