Submission Title: Dallas 802.11i/802.15 Liaison Report. January, 2003 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Dallas 802.11i/802.15 Liaison Report. Date Submitted: 14 March, 2003 Source: Daniel V. Bailey Company: NTRU Address: 5 Burlington Woods, Burlington, MA 01803 Voice: 781-418-2522 , FAX: 781-418-2532, E-Mail: dbailey@ntru.com Abstract: Purpose: For information Notice: This document has been prepared to assist the IEEE P802.15. 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 acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15 Daniel V. Bailey, NTRU

Post LB 52 LB52 concluded before Ft. Lauderdale January, 2003 Post LB 52 LB52 concluded before Ft. Lauderdale Yes: 76.28%, No: 23.72%, Abs: 7.12% Yes: 209, No: 65, Abs: 21 Total voting members: 321 Total returned: 295 Total returned %: 91.90% 2,074 comments received 1,262 technical Daniel V. Bailey, NTRU

January, 2003 Seattle ad-hoc Minutes in 11-03-150r0-I-TGi-Seattle-WA-Meeting-Minutes-February-2003.doc Entering March plenary, about 75% of comments have been resolved Daniel V. Bailey, NTRU

January, 2003 Major Issue: Roaming Roaming and secure handoff too slow for uninterrupted VoIP (11-03-084r1) STA moving from AP to AP securely Compromise proposal in 11-03-241r0 was not accepted by the group, but the sense of the group was that it was a good starting point. Daniel V. Bailey, NTRU

January, 2003 Major Issue: Roaming In draft 3, when a device roams from one AP to another it has to reestablish symmetric keys from scratch Compromise suggests using Pairwise Master Key delivered by AS as the base roaming key to generate AP-STA unique data keys And a different key derivation function to allow STAs to precompute the AP-STA key Next two slides from 11-03-241r0 Daniel V. Bailey, NTRU

Initial Association AS STA AP January, 2003 802.11 Open Authentication Association Req + RSN IE Association Response (success) EAP type specific mutual authentication AKM is relayed to AS using same back-end protocol (e.g. Radius attribute) Derive Pairwise Master Key (PMK1) Derive Pairwise Master Key (PMK1) 802.1X/EAP-SUCCESS Access ACCEPT (PMK1) 4-way handshake Group Key Install TK Install TK Daniel V. Bailey, NTRU

Rekeying Re-association January, 2003 Rekeying Re-association AP STA PMK-R, PMKIDSTA, Counter1 PMK-R, PMKIDAP, Counter2 Counter1 = Counter1 + 1, PTK-R = KMIK | KMEK | TK = Roaming-PRF() Re-assoc Req (RSN IE(AKM=RKH, {PMKIDSTA}), {Fast-Rekey IE(Counter1 , Srand)}) if MKIDSTA == MKIDAP if (AKM=RKH and Counter1 > Counter2) then KMIK | KMEK | TK = Roaming-PRF() else initiate 4-way handshake initiate 802.1X Re-assoc Resp (RSN IE, {Fast-Rekey IE(Counter2, Arand, RSC, EKMEK(GTK), MIC)}) EAPOL-Key( Arand, MIC) Install TK Counter2 = Counter1 Daniel V. Bailey, NTRU

Next Steps Ad-Hoc March 22, 23 & 24 Recirculation expected in March January, 2003 Next Steps Ad-Hoc March 22, 23 & 24 Santa Clara, CA Recirculation expected in March Now expect sponsor ballot in December. WiFi Alliance expects to begin certifying AES-CCM implementations in January 2004 Daniel V. Bailey, NTRU