Augmented Password-Authenticated Key Exchange (AugPAKE)
draft-irtf-cfrg-augpake-07

Document Type Active Internet-Draft (cfrg RG)
Last updated 2017-01-16
Stream IRTF
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream IRTF state (None)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
Internet Research Task Force                                   S.H. Shin
Internet-Draft                                                 K. Kobara
Intended status: Informational                                      AIST
Expires: July 21, 2017                                  January 17, 2017

        Augmented Password-Authenticated Key Exchange (AugPAKE)
                       draft-irtf-cfrg-augpake-07

Abstract

   This document describes a secure and highly-efficient augmented
   password-authenticated key exchange (AugPAKE) protocol where a user
   remembers a low-entropy password and its verifier is registered in
   the intended server.  In general, the user password is chosen from a
   small set of dictionary whose space is within the off-line dictionary
   attacks.  The AugPAKE protocol described here is secure against
   passive attacks, active attacks and off-line dictionary attacks (on
   the obtained messages with passive/active attacks).  Also, this
   protocol provides resistance to server compromise in the context that
   an attacker, who obtained the password verifier from the server, must
   at least perform off-line dictionary attacks to gain any advantage in
   impersonating the user.  The AugPAKE protocol is not only provably
   secure in the random oracle model but also the most efficient over
   the previous augmented PAKE protocols (SRP and AMP).

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."

   This Internet-Draft will expire on July 21, 2017.

Shin & Kobara            Expires July 21, 2017                  [Page 1]
Internet-Draft          Augmented PAKE (AugPAKE)            January 2017

Copyright Notice

   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
   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
   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Keywords  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  AugPAKE Specification . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Underlying Group  . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Notation  . . . . . . . . . . . . . . . . . . . . . . . .   4
       2.2.1.  Password Processing . . . . . . . . . . . . . . . . .   6
     2.3.  Protocol  . . . . . . . . . . . . . . . . . . . . . . . .   6
       2.3.1.  Initialization  . . . . . . . . . . . . . . . . . . .   7
       2.3.2.  Actual Protocol Execution . . . . . . . . . . . . . .   7
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
     3.1.  General Assumptions . . . . . . . . . . . . . . . . . . .   9
     3.2.  Security against Passive Attacks  . . . . . . . . . . . .   9
     3.3.  Security against Active Attacks . . . . . . . . . . . . .  10
       3.3.1.  Impersonation Attacks on User U . . . . . . . . . . .  10
       3.3.2.  Impersonation Attacks on Server S . . . . . . . . . .  10
       3.3.3.  Man-in-the-Middle Attacks . . . . . . . . . . . . . .  11
     3.4.  Security against Off-line Dictionary Attacks  . . . . . .  11
     3.5.  Resistance to Server Compromise . . . . . . . . . . . . .  12
   4.  Implementation Consideration  . . . . . . . . . . . . . . . .  13
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  Features of AugPAKE  . . . . . . . . . . . . . . . .  15
   Appendix B.  Test Vector of AugPAKE . . . . . . . . . . . . . . .  16
   Appendix C.  AugPAKE over EC Groups . . . . . . . . . . . . . . .  18
Show full document text