Preparation and Comparison of Internationalized Strings Representing Simple User Names and Passwords
draft-melnikov-precis-saslprepbis-02

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Document Type Active Internet-Draft (individual)
Authors Peter Saint-Andre  , Alexey Melnikov 
Last updated 2012-09-13
Replaced by RFC 7613, RFC 7613
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Precis                                                    P. Saint-Andre
Internet-Draft                                       Cisco Systems, Inc.
Obsoletes: 4013 (if approved)                                A. Melnikov
Intended status: Standards Track                               Isode Ltd
Expires: March 17, 2013                               September 13, 2012

  Preparation and Comparison of Internationalized Strings Representing
                    Simple User Names and Passwords
                  draft-melnikov-precis-saslprepbis-02

Abstract

   This document describes how to handle Unicode strings representing
   simple user names and passwords, primarily for purposes of
   comparison.  This profile is intended to be used by Simple
   Authentication and Security Layer (SASL) mechanisms (such as PLAIN
   and SCRAM-SHA-1), as well as other protocols that exchange simple
   user names or user passwords.  This document obsoletes RFC 4013.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on March 17, 2013.

Copyright Notice

   Copyright (c) 2012 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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   (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

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   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.  Overview . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Simple User Names  . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Definition . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.2.  Preparation  . . . . . . . . . . . . . . . . . . . . . . .  4
     2.3.  Migration  . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Passwords  . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Definition . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.2.  Preparation  . . . . . . . . . . . . . . . . . . . . . . .  6
     3.3.  Migration  . . . . . . . . . . . . . . . . . . . . . . . .  7
   4.  Open Issues  . . . . . . . . . . . . . . . . . . . . . . . . .  7
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
     5.1.  Password/Passphrase Strength . . . . . . . . . . . . . . .  8
     5.2.  Reuse of PRECIS  . . . . . . . . . . . . . . . . . . . . .  8
     5.3.  Reuse of Unicode . . . . . . . . . . . . . . . . . . . . .  8
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
     6.1.  Use of NameClass . . . . . . . . . . . . . . . . . . . . .  8
     6.2.  Use of FreeClass . . . . . . . . . . . . . . . . . . . . .  8
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     7.1.  Normative References . . . . . . . . . . . . . . . . . . .  9
     7.2.  Informative References . . . . . . . . . . . . . . . . . .  9
   Appendix A.  Differences from RFC 4013 . . . . . . . . . . . . . . 10
   Appendix B.  Acknowledgements  . . . . . . . . . . . . . . . . . . 11
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11

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1.  Introduction

1.1.  Overview

   User names and passwords are used pervasively in authentication and
   authorization on the Internet.  To increase the likelihood that the
   input and comparison of user names and passwords will work in ways
   that make sense for typical users throughout the world, this document
   defines rules for preparing and comparing internationalized strings
   that represent simple user names and passwords.

   The algorithms defined in this document assume that all strings are
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