Hi Henry,
About the 24/1919/(TSF protection), we have two comments,
-
As the BIPN is derived from TBTT (per beacon) level, the resolution of the protected TSF is within one beacon period. Is this resolution fine enough? For example, the document has a use case of modifying
the TWT timing to make STA wake at incorrect time. In many use cases, the TWT interval/duration is less than one beacon period. So even with this proposed method, the attacker can still manipulate the TSF to be any value within one beacon period and can be
able to mislead STA to wrong TWT timing.
Is it better to protect the TSF with a more finer time resolution? i.e. to protect more bits of the 64-bit TSF value?
-
The proposed method uses the beacon period as basic denominator. If the value of beacon period is greater than 2^5 (32 TU), all the MSB bits of 64-bit TSF can be protected. But if the beacon period
is small, the most MSB bit(s) of 64-bit TSF may not be protected. For example, if the beacon period is 32 TU (this value is allowed by spec), then the 48-bit BIPN can only cover the Bit62~Bit15 of the 64-bit TSF, leaving the MSB Bit63 of TSF not protected
and be vulnerable to be manipulated.
Best,
Yanchao Xu
From: Henry Ptasinski <henry@xxxxxxxxxx>
Sent: 2025年4月28日
2:20
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGM] 24/1915 (SAQ for low-tx devices) and 24/1919 (TSF protection)
[ EXTERNAL EMAIL ]
--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---
Thanks for the comments Mark.
I've uploaded revised versions of both docs.
- Henry
On Thu, Mar 20, 2025 at 6:50 AM Mark Rison <m.rison@xxxxxxxxxxx> wrote:
Thanks for these. I attach some comments.
Mark
--
Mark RISON, Standards Architect, WLAN English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
1 Cambridge Square, Cambridge CB4 0AE Fax: +44 1223 434601
ROYAUME UNI WWW: http://www.samsung.com/uk
From: *** IEEE STDS-802-11 List *** <STDS-802-11@xxxxxxxxxxxxxxxxx> On Behalf Of Henry Ptasinski
Sent: Tuesday, 18 March 2025 21:38
To: STDS-802-11@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11] TGmf teleconference announcement - 28 April
--- This message came from the IEEE 802.11 Working Group Reflector ---
Hi Mike,
Please add 11-24/1915 and 11-24/1919 to the queue. These both have minor changes to address comments received from when I presented them in Nov.
Thanks,
- Henry
On Thu, Mar 13, 2025 at 2:13 PM M Montemurro <montemurro.michael@xxxxxxxxx> wrote:
--- This message came from the IEEE 802.11 Working Group Reflector ---
Hello everyone,
As discussed yesterday, TGmf will be holding a teleconference at 10am ET on 28 April 2025 for 2 hours.
The agenda for the teleconference will include contributions that we were unable to review during the session this week.
Cheers,
Mike
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