WAVE Random MAC Address Month Year doc.: IEEE 802.11-yy/xxxxr0 January 2005 WAVE Random MAC Address Date: 2005-01-17 Authors: Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <stuart.kerry@philips.com> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Lee Armstrong, Armstrong Consulting, Inc. John Doe, Some Company

Month Year doc.: IEEE 802.11-yy/xxxxr0 January 2005 Abstract Questions raised since the November meeting challenged the ability of WAVE OBUs to periodically change their MAC address. This has been investigated and found to be in compliance with existing 802.11 standard as well as address registration processes. The 11p draft will retain reference to such address changes, leaving the determination of when and how to implement the responsibility of IEEE P1609 (upper layers standard) Lee Armstrong, Armstrong Consulting, Inc. John Doe, Some Company

January 2005 Original Proposal WAVE OBUs would change their MAC addresses periodically in order to ensure anonymity Original plan was for changing address with every vehicle start Use random number generator, but block off registered values Recent request to change address more frequently, such as at every RSU Only applies within the ITS band RSUs would not do this, would act more like a conventional 802.11 Access Point Lee Armstrong, Armstrong Consulting, Inc.

January 2005 Anonymity concerns A fixed MAC address would allow any given vehicle to be tracked wherever it goes Lack of privacy Could not prevent private uses Automatic speed tickets, other questionable rights violations “Big Brother” perceptions could never be alleviated Lack of anonymity would discourage the public from using these devices Vehicle manufacturers would no longer support program Drivers would disable devices Loss of public safety benefits Lee Armstrong, Armstrong Consulting, Inc.

Concerns expressed since November January 2005 Concerns expressed since November All addresses must be registered with RAC Not true if the address is not global The OBU addresses would not be global, the RSU will normally be, but not the OBU All addresses must be unique globally (thus leading to the need for registration) Only for devices that exist within the global environment, not true of OBUs Lee Armstrong, Armstrong Consulting, Inc.

January 2005 Current plan OBU MAC address will be changed periodically under the direction of the WAVE Management Entity defined in IEEE P1609.3 OBU MAC addresses will be locally and not globally administered Lee Armstrong, Armstrong Consulting, Inc.

January 2005 References IEEE 802.11-1999, page 360 "A locally-administered MAC address may be used in lieu of the unique, globally-administered MAC address assigned to the station. However, the value of dot11MacAddress may not change during MAC operation." Lee Armstrong, Armstrong Consulting, Inc.