Review of the CFRG PAKE Proposals
draft-sheffer-cfrg-pake-review-00

Document Type Active Internet-Draft (individual)
Last updated 2019-10-31
Stream (None)
Intended RFC status (None)
Formats plain text xml pdf htmlized 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)
Crypto Forum Research Group                                   Y. Sheffer
Internet-Draft                                                    Intuit
Intended status: Informational                          October 31, 2019
Expires: May 3, 2020

                   Review of the CFRG PAKE Proposals
                   draft-sheffer-cfrg-pake-review-00

Abstract

   This draft consists of the author's review of the password-
   authenticated key exchange (PAKE) protocols, as submitted to the
   IRTF's CFRG.  All opinions here are the author's alone.

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 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 May 3, 2020.

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.

Sheffer                    Expires May 3, 2020                  [Page 1]
Internet-Draft             Sheffer PAKE Review              October 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Disclaimer  . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  Conventions used in this document . . . . . . . . . . . .   3
   2.  Preliminaries . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Protocol Completeness and Clarity . . . . . . . . . . . .   3
     2.2.  Integration into Existing Protocols . . . . . . . . . . .   4
   3.  Detailed Review . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Balanced Algorithms . . . . . . . . . . . . . . . . . . .   4
       3.1.1.  SPAKE2  . . . . . . . . . . . . . . . . . . . . . . .   4
       3.1.2.  J-PAKE  . . . . . . . . . . . . . . . . . . . . . . .   4
       3.1.3.  SPEKE . . . . . . . . . . . . . . . . . . . . . . . .   4
       3.1.4.  CPace . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Augmented Algorithms  . . . . . . . . . . . . . . . . . .   5
       3.2.1.  OPAQUE  . . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.2.  AuCPace . . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.3.  VTBPEKE . . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.4.  BSPAKE  . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Conclusions . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Informative References  . . . . . . . . . . . . . . . . . . .   6
   Appendix A.  Document History . . . . . . . . . . . . . . . . . .   8
     A.1.  draft-sheffer-cfrg-pake-review-00 . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The CFRG took upon itself to review multiple proposed PAKE algorithms
   and select zero or more of them as suitable for general use in IETF
   protocols.  Eight protocols were submitted for consideration, and
   they are listed on the CFRG GitHub repository:
   https://github.com/cfrg/pake-selection.

   Over the last few months multiple reviews were submitted to the CFRG,
   evaluating the protocols' cryptographic quality as well as their
   engineering properties.  As the last stage of this process, members
   of the CFRG Crypto Review Panel were asked to provide summary
   reviews, and this document is the author's contribution as a Panel
   member.

1.1.  Disclaimer

   The author is not a cryptographer.  Specifically, I do not have the
   skills to prove security of such protocols, nor even to evaluate the
   quality of such proofs.  I do, however, possess a reasonable amount
   of experience in integrating cryptography into protocols, including
   PAKE-based algorithms [RFC6124] [RFC6631].

Sheffer                    Expires May 3, 2020                  [Page 2]
Internet-Draft             Sheffer PAKE Review              October 2019

1.2.  Conventions used in this document

   This is essentially an opinion piece and does not employ any
Show full document text