Requirements for PAKE schemes
draft-irtf-cfrg-pake-reqs-08

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Last updated 2017-03-21 (latest revision 2017-02-08)
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Internet Research Task Force                                  J. Schmidt
Internet-Draft                                 secunet Security Networks
Intended status: Informational                          February 8, 2017
Expires: August 12, 2017

                     Requirements for PAKE schemes
                      draft-irtf-cfrg-pake-reqs-08

Abstract

   Password-Authenticated Key Agreement (PAKE) schemes are interactive
   protocols that allow the participants to authenticate each other and
   derive shared cryptographic keys using a (weaker) shared password.
   This document reviews different types of PAKE schemes.  Furthermore,
   it presents requirements and gives recommendations to designers of
   new schemes.  It is a product of the Crypto Forum Research Group
   (CFRG).

Status of This Memo

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

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   This Internet-Draft will expire on August 12, 2017.

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   Copyright (c) 2017 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
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   include Simplified BSD License text as described in Section 4.e of

Schmidt                  Expires August 12, 2017                [Page 1]
Internet-Draft        Requirements for PAKE schemes        February 2017

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Requirements notation . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  PAKE Taxonomy . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Storage of the Password . . . . . . . . . . . . . . . . .   3
     3.2.  Transmission of Public Keys . . . . . . . . . . . . . . .   4
     3.3.  Two Party versus Multiparty . . . . . . . . . . . . . . .   4
   4.  Security of PAKEs . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Implementation Aspects  . . . . . . . . . . . . . . . . .   6
     4.2.  Special case: Elliptic Curves . . . . . . . . . . . . . .   6
   5.  Protocol Considerations and Applications  . . . . . . . . . .   6
   6.  Privacy . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Performance . . . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   9
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     11.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Requirements notation

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

2.  Introduction

   Passwords are the predominant method of accessing the Internet today
   due, in large part, to their intuitiveness and ease of use.  Since a
   user needs to enter passwords repeatedly in many connections and
   applications, these passwords tend to be easy to remember and be able
   to be entered repeatedly with a low probability of error.  They tend
   to be low-grade and not-so-random secrets that are susceptible to
   brute-force guessing attacks.

   A Password-Authenticated Key Exchange (PAKE) attempts to address this
   issue by constructing a cryptographic key exchange that does not
   result in the password, or password-derived data, being transmitted
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