Enhanced Randomized MAC Address Method
This document describes a method, Enhanced Randomized and Changing MAC address (ERCM), for dynamically changing the MAC address of a non-AP station in IEEE 802.11 networks. The method involves generating a new transient MAC address using shared private information and a pseudo-random generator. This approach enhances privacy and security by making it difficult for unauthorized stations to correlate MAC addresses with specific devices.
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January 2022 doc.: IEEE 802.11-22/0114r0 Enhanced Randomized and Changing MAC address (ERCM) Date: 2022-01-03 Authors: Name St phane Baron Affiliations Canon Address Phone email Stephane.baron@crf.canon.fr Julien Sevin Canon Julien.sevin@crf.canon.fr Submission Slide 1 Stzphane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 Revisions R0 Initial Version Submission Slide 2 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 Abstract Current contribution describes a method to change the public MAC Address of an associated STA using a standard pseudo random generator based on shared private information. The change can be at the AP STA or non-AP STA initiative. This method makes correlation between a MAC address and a given STA very difficult for non registered STA. Submission Slide 3 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 Overview Specifying an Enhanced RCM (ERCM) procedure allowing the dynamic change of the MAC address of a non-AP STA when it is associated with an AP. 1. 2. After association, encrypted information (ERCM key) is shared between AP and non-AP STA. Upon AP or non-AP STA request, both AP and non-AP STA compute a new transient MAC address for the changing STA, without sharing it, by using same pseudo random generator with same parameters. At the request for changing the MAC address of the non-AP station initiated by the AP or the non-AP STA, both AP and non-AP STA apply the MAC address change for the changing STA. 3. Submission Slide 4 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 ERCM Key After association, encrypted information (ERCM key) is shared between AP and non-AP via specific action frames Submission Slide 5 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 New transient MAC address Upon AP or non-AP STA request, both AP and non-AP STA compute a new transient MAC address for the changing STA, without sharing it, by using the standardized PRF-128 (section 12.7.1.2 -IEEE Std 802.11-202) with same parameters. @MAC (n+1) = PRF-128/46( ERCM Key, ERCM , @MAC (n) , 128) From the generated 128 bits, the leftmost 46 bits (i.e. the 46 most significant bits) are selected In addition to the 46 bits, the U/L bit of the new MAC address is set to 1, the I/G bit is set to 0 @MAC (n) corresponds to the current address MAC of the non-AP STA Submission Slide 6 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 Synchronous change of the MAC address At the request for changing the MAC address of the non-AP station initiated by the AP or the non-AP STA, both AP and non-AP STA apply the MAC address change for the changing STA. AP Initiation ERCM intended to all the non-AP stations ERCM-capable Use of a new ERCM IE to be included in the beacon frame including an ERCM Change counter corresponding to the number of TBTTs until the next transient MAC address is effective Non-AP Initiation Use of a new action frame including an ERCM Change date corresponding to the number of TBTTs until the next transient MAC address is effective Submission Slide 7 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 Main principle Non-AP Initiation AP Initiation AP Non-AP STA AP Non-AP STA Non-AP STA ERCM change Request Beacon ERCM Change counter = k ERCM Change Date Beacon ERCM change Response ERCM Change counter = k- 1 Beacon Beacon ERCM Change counter = 0 ERCM change Date ERCM change Date Submission Slide 8 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 Benefits The user privacy is now ensured also when the non-AP STA is associated. Submission Slide 9 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 References IEEE 802.11-21/1854r1 Association MAC Address based on AID (A-AMAC) IEEE 802.11-21/1539r0 Rotating MAC Addresses Over the Air Submission Slide 10 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 ERCM Capability An ERCM Capability field is used in the STA and AP to advertise their capability to support ERCM Extended Capabilities Element ID Length Insert new row in Table 9-153 Extended Capabilities field, Clause 9.4.2.26 Insert new row in Table 9-153 Extended Capabilities field, Clause 9.4.2.26 Bit Information Notes <ANA> Enhanced RCM Capabilitiy The STA sets Enhanced RCM Capabilities bit to 1 to indicate support for Enhanced RCM and sets to 0 if Enhanced RCM is not supported. 1131 Submission Slide 11 Stephane Baron, Canon
January 2022 doc.: IEEE 802.11-22/0114r0 ERCM Action frame Code Meaning Category ERCM Action <ANA> Enhanced RCM ERCM Key delivery Request added in the Table 9-51 Category values ERCM Key ERCM Action Category ERCM Key delivery Response 832 830 Action Field value Meaning Category ERCM Action 1 ERCM Key delivery Request ERCM Key delivery Confirm 2 ERCM Key delivery Response Category ERCM Action ERCM Change Date 3 4 5 ERCM Key delivery Confirm ERCM change Request ERCM change Response ERCM change Request ERCM Action Category Insert new clause at end of 9.6 Action frame format details ERCM change Response 843 Submission Slide 12 Stephane Baron, Canon 840
