Hybrid Post-Quantum Key Encapsulation Methods (PQ KEM) for Transport Layer Security 1.2 (TLS)
draft-campagna-tls-bike-sike-hybrid-01

Document Type Active Internet-Draft (individual)
Last updated 2019-05-07
Stream (None)
Intended RFC status (None)
Formats plain text pdf xml html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
Internet Engineering Task Force                              M. Campagna
Internet-Draft                                               E. Crockett
Intended status: Experimental                                        AWS
Expires: November 8, 2019                                    May 7, 2019

  Hybrid Post-Quantum Key Encapsulation Methods (PQ KEM) for Transport
                        Layer Security 1.2 (TLS)
                 draft-campagna-tls-bike-sike-hybrid-01

Abstract

   Hybrid key exchange refers to executing two independent key exchanges
   and feeding the two resulting shared secrets into a Pseudo Random
   Function (PRF), with the goal of deriving a secret which is as secure
   as the stronger of the two key exchanges.  This document describes
   new hybrid key exchange schemes for the Transport Layer Security 1.2
   (TLS) protocol.  The key exchange schemes are based on combining
   Elliptic Curve Diffie-Hellman (ECDH) with a post-quantum key
   encapsulation method (PQ KEM) using the existing TLS PRF.  In
   particular, this document specifies the use of the Bit Flipping Key
   Exchange (BIKE) and Supersingular Isogeny Key Exchange (SIKE) schemes
   in combination with ECDHE as a hybrid key agreement in a TLS 1.2
   handshake.

Context

   This draft is experimental.  It is intended to define hybrid key
   exchanges in sufficient detail to allow independent experimentations
   to interoperate.  While the NIST standardization process is still a
   few years away from being complete, we know that many TLS users have
   highly sensitive workloads that would benefit from the speculative
   additional protections provided by quantum-safe key exchanges.  These
   key exchanges are likely to change through the standardization
   process.  Early experiments serve to understand the real-world
   performance characteristics of these quantum-safe schemes as well as
   provide speculative additional confidentiality assurances against a
   future adversary with a large-scale quantum computer.

   Comments are solicited and can be sent to all authors at
   mcampagna@amazon.com.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

Campagna & Crockett     Expires November 8, 2019                [Page 1]
Internet-Draft         Hybrid Key Exchange for TLS              May 2019

   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 https://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."

   This Internet-Draft will expire on November 8, 2019.

Copyright Notice

   Copyright (c) 2019 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
   (https://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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Key Exchange Algorithms . . . . . . . . . . . . . . . . . . .   4
     2.1.  Key Encapsulation Method (KEM)  . . . . . . . . . . . . .   5
     2.2.  ECDHE_[KEM] . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Hybrid Premaster Secret . . . . . . . . . . . . . . . . . . .   6
   4.  TLS Extension for Supported PQ KEM Parameters . . . . . . . .   7
   5.  Data Structures and Computations  . . . . . . . . . . . . . .   7
     5.1.  Client Hello Extensions . . . . . . . . . . . . . . . . .   8
       5.1.1.  When these extensions are sent  . . . . . . . . . . .   8
       5.1.2.  Meaning of these extensions . . . . . . . . . . . . .   8
       5.1.3.  Structure of these extensions . . . . . . . . . . . .   8
       5.1.4.  Actions of the sender . . . . . . . . . . . . . . . .   8
       5.1.5.  Actions of the receiver . . . . . . . . . . . . . . .   8
       5.1.6.  Supported PQ KEM Parameters Extension . . . . . . . .   9
     5.2.  Server Key Exchange . . . . . . . . . . . . . . . . . . .  10
       5.2.1.  When this message is sent . . . . . . . . . . . . . .  10
       5.2.2.  Meaning of this message . . . . . . . . . . . . . . .  10
Show full document text