One document matched: draft-dupont-ipv6-imei-04.txt

Differences from draft-dupont-ipv6-imei-03.txt

Internet Engineering Task Force                         Francis Dupont
INTERNET DRAFT                                           Loutfi Nuaymi
Expires in March 2004                                    ENST Bretagne
                                                          October 2003


                 IMEI-based universal IPv6 interface IDs

                    <draft-dupont-ipv6-imei-04.txt>


Status of this Memo
   
   This document is an Internet Draft and is in full conformance with
   all provisions of Section 10 of RFC 2026.

   This document is an Internet-Draft.  Internet-Drafts are working
   documents of the Internet Engineering Task Force (IETF), its
   areas, and its working groups.  Note that other groups may also
   distribute working documents as Internet-Drafts.

   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."

   The list of current Internet Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   Distribution of this memo is unlimited.

Abstract

   The IPv6 addressing architecture [1] defines a modified EUI-64
   format for interface identifiers. These interface identifiers may
   have global scope when a global token is available (e.g., IEEE 802
   48-bit MAC or IEEE EUI-64 identifiers). Such a global token, the
   IMEI (International Mobile station Equipment Identity), is defined
   for GSM and UMTS terminals [2, 3, 4] and has the same properties
   than identifiers based on IEEE standards.

   This document explains the construction of a global IPv6 interface
   identifier from an IMEI.


draft-dupont-ipv6-imei-03.txt                                 [Page 1]

INTERNET-DRAFT          IMEI-based interface IDs              Oct 2003


1. Modified EUI-64 Interface Identifiers

   The modified EUI-64 format is required for all unicast addresses,
   except those that start with binary value 000. Two bits have a
   special role in IEEE EUI-64 and in modified EUI-64: the "u" bit,
   one means global scope, zero local scope, and the "g" bit which
   is the "individual/group" in IEEE standards and is always set to
   zero for any modified EUI-64 identifier derived from an IEEE 802
   identifier.

   So when both the "u" and "g" bits are set to one, a modified EUI-64
   identifier has a global scope (i.e. is universal) and is not
   derived from an IEEE identifier.


2. IMEIs

   The IMEI (International Mobile station Equipment Identities) is 14
   decimal digit number attached to the hardware of any GSM [2, 3]
   or UMTS [4] terminal. It is usually written on a label in the
   battery compartment of the handset or displayed when dialing the
   code *#06# (it can come with a spare digit and/or the software
   version number), etc. The Mobile Station Equipment is uniquely
   defined by the IMEI.

   The EIR (Equipment Identity Register) is the database of all
   IMEIs, it can be used in order to block or trace stolen terminals
   even only some operators currently check IMEIs.

   The IMEI is divided into a Type Approval Code (which begins by
   a country code) on 6 decimal digits followed by a Final Assembly
   Code on 2 decimal digits and the Serial Number on 6 decimal
   digits. The IMEI has the same properties than an IEEE MAC-48
   address, it is attached to the hardware and reveals only basic
   information like the producer and the model of the hardware
   (this is not always true for ESN (Electronic Serial Numbers)
   which are used in some USA mobile phone networks).

   IMEIs are globally unique, two different equipments can be
   assumed to have different IMEIs and when this is not true
   (manufacturer error, hardware problem, cloning) the problem can
   cause damage at a higher level than interface identifier
   collision, exactly as a MAC address collision is a very serous
   incident which has nothing in common with an interface identifier
   collision.


draft-dupont-ipv6-imei-03.txt                                 [Page 2]

INTERNET-DRAFT          IMEI-based interface IDs              Oct 2003


3. IMEI-based Interface Identifiers

   This document defines a method to create an interface identifier
   in the modified EUI-64 format from an IMEI. The first octet is 03
   in hexadecimal ("u" and "g" bits set to one, others to zero)
   followed by the 14 decimal digits of the IMEI in BCD (Binary
   Coded Decimal), i.e. with each decimal digit mapped to its value
   on 4 bits.

   The IMEI 330001 53 007826 gives the 0333:0001:5300:7826 (usually
   written 333:1:5300:7826) interface identifier.

4. Security Considerations

   The security considerations of IMEI-based interface identifiers
   are exactly the same than for IEEE EUI-64, EUI-48 or MAC-48
   based interface identifiers. The concerns about traceability
   and/or privacy are addressed in [5].

   The IMEI is supposedly used to report stolen terminals to telecom
   operators. It seems common sense that these operators are to
   perform some additional owner's identity verification before
   accepting such kind of report. Somebody capable of intercepting
   the IMEI of a terminal cannot easily report it as stolen.

5. Acknowledgments

   The idea came during an E-mail exchange about Marcelo Bagnulo's
   draft [6] on random generation of interface identifiers.
   Our GSM expert, Xavier Lagrange, provides in some seconds all the
   GSM and 3GPP references and the (real) IMEI of the example.
   The same idea was developped in the EU project "Moby Dick" [7]
   (signaled by Michelle Wetterwald).

6. Normative References

   [1] R. Hinden, S. Deering, "Internet Protocol Version 6 (IPv6)
   Addressing Architecture", RFC 3513, April 2003.

   [2] "Digital cellular telecommunications system: Numbering,
   addressing and identification", ETS 300 927 aka GSM 03.03,
   ETSI, November 1999.

   [3] "Digital cellular telecommunications system: International
   Mobile station Equipment Identities (IMEI)", GSM 02.16,
   ETSI, February 2000.


draft-dupont-ipv6-imei-03.txt                                 [Page 3]

INTERNET-DRAFT          IMEI-based interface IDs              Oct 2003


   [4] "3rd Generation Partnership Project: Technical Specification
   Group Core Network; Numbering, addressing and identification
   (Release 1999)", 3GPP TS 23.003, 3GPP, June 2001.

   [5] T. Narten, R. Draves, "Privacy Extensions for Stateless Address
   Autoconfiguration in IPv6", RFC 3041, January 2001.

7. Informative References

   [6] M. Bagnulo, I. Soto, A. Garcia-Martinez, A. Azcorra,
   "Random generation of interface identifiers",
   draft-soto-mobileip-random-iids-00.txt, January 2002.

   [7] M. Liebsch, X. Perez, R. Schmitz, A. Sarma, J. Jaehnert,
   S. Tessier, M. Wetterwald, I. Soto, "Solutions for IPv6-based
   mobility in the EU project Moby Dick", WTC 2002, Paris,
   22-27 September 2002.

8. Changes from Previous Drafts

   The Security Considerations section was updated to answer to a
   concern raised at the 53th IETF at Minneapolis in March 2002.

   A reference to a conference paper which includes this idea was
   added in the Informative References section.

9. Authors' Addresses

   Francis Dupont
   ENST Bretagne
   Campus de Rennes
   2, rue de la Chataigneraie
   CS 17607
   35576 Cesson-Sevigne Cedex
   FRANCE
   Fax: +33 2 99 12 70 30
   EMail: Francis.Dupont@enst-bretagne.fr

   Loutfi Nuaymi
   ENST Bretagne
   Campus de Rennes
   2, rue de la Chataigneraie
   CS 17607
   35576 Cesson-Sevigne Cedex
   FRANCE
   Fax: +33 2 99 12 70 30
   EMail: Loutfi.Nuaymi@enst-bretagne.fr

draft-dupont-ipv6-imei-03.txt                                 [Page 4]