Preparation and Comparison of Internationalized Strings Representing Simple User Names and Passwords
draft-ietf-precis-saslprepbis-01

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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: September 28, 2013                               March 27, 2013

  Preparation and Comparison of Internationalized Strings Representing
                    Simple User Names and Passwords
                    draft-ietf-precis-saslprepbis-01

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 passwords.  This document obsoletes RFC 4013.

Status of This Memo

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   This Internet-Draft will expire on September 28, 2013.

Copyright Notice

   Copyright (c) 2013 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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Saint-Andre & Melnikov Expires September 28, 2013               [Page 1]
Internet-Draft      PRECIS: Usernames and Passwords           March 2013

   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.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Simple User Names . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Preparation . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Passwords . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Preparation . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Migration . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  User Names  . . . . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Passwords . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
     5.1.  Password/Passphrase Strength  . . . . . . . . . . . . . .   9
     5.2.  Reuse of PRECIS . . . . . . . . . . . . . . . . . . . . .   9
     5.3.  Reuse of Unicode  . . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Use of IdentifierClass  . . . . . . . . . . . . . . . . .   9
     6.2.  Use of FreeformClass  . . . . . . . . . . . . . . . . . .  10
   7.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  Differences from RFC 4013  . . . . . . . . . . . . .  12
   Appendix B.  Acknowledgements . . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

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.  (In many
   authentication technologies passwords are not directly compared
   because the actual password is used as input to an algorithm such as
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