Username and Password Preparation Algorithms
draft-melnikov-precis-saslprepbis-00

The information below is for an old version of the document
Document Type Active Internet-Draft (individual)
Authors Peter Saint-Andre  , Alexey Melnikov 
Last updated 2012-03-05
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: September 6, 2012                                 March 5, 2012

              Username and Password Preparation Algorithms
                  draft-melnikov-precis-saslprepbis-00

Abstract

   This document describes how to prepare Unicode strings representing
   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

   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
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   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 6, 2012.

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
   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

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   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.  User Name Preparation . . . . . . . . . . . . . . . . . . . . . 4
   3.  Password Preparation  . . . . . . . . . . . . . . . . . . . . . 5
   4.  ToDo  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
     5.1.  Password Strength . . . . . . . . . . . . . . . . . . . . . 6
     5.2.  Reuse of PRECIS . . . . . . . . . . . . . . . . . . . . . . 6
     5.3.  Reuse of Unicode  . . . . . . . . . . . . . . . . . . . . . 6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
     6.1.  Use of NameClass  . . . . . . . . . . . . . . . . . . . . . 6
     6.2.  Use of FreeClass  . . . . . . . . . . . . . . . . . . . . . 6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 7
     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 7
   Appendix A.  Differences from RFC 4013  . . . . . . . . . . . . . . 8
   Appendix B.  Acknowledgements . . . . . . . . . . . . . . . . . . . 8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 9

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1.  Introduction

1.1.  Overview

   The use of simple user names and passwords in authentication and
   authorization is pervasive on the Internet.  To increase the
   likelihood that user name and password input and comparison both work
   in ways that make sense for typical users throughout the world, this
   document defines rules for preparing internationalized user names and
   passwords, primarily for purposes of comparison.

   The algorithms defined in this document assume that all strings are
   comprised of characters from the Unicode [UNICODE] character set.

   The Unicode string preparation algorithms are designed for use in
   Simple Authentication and Security Layer ([SASL]) mechanisms, such as
   PLAIN [RFC4616] and SCRAM-SHA-1 [RFC5802].  They may be applicable
   where simple user names and passwords are used.  This profile is not
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