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Re: [STDS-802-11-TGM] Fwd: [STDS-802-11-TGM] Resolution to CID 116



--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

 

  Jouni,

 

  Can you make a submission that has change bars showing what text changed? I like your paragraph but then I like Nehru's too. And while I'm not so fond of my original text I don't think it's as ambiguous as some are making it out to be. So if we could see the changes being proposed it would help. These "replace the entire paragraph with this…" kinds of resolutions make me a little leery.

 

  regards,

 

  Dan.

 

--

"the object of life is not to be on the side of the majority, but to

escape finding oneself in the ranks of the insane." – Marcus Aurelius

 

On 10/6/21, 1:27 PM, "Jouni Malinen" <jkmalinen@xxxxxxxxx> wrote:

 

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

It would be unfortunate if we cannot address a comment that is identifying a clear ambiguous description of behavior in a security related subclause and comes with a proposed text to address the issue. If that minimal change is not considered acceptable, I'd address this by changing the paragraph in question into following which is clearer on which steps apply to which condition with some duplication needed for doing that:

 

"Upon receipt of a Com event, the t0 (retransmission) timer shall be canceled. If the Status is nonzero, the frame shall be silently discarded, the t0 (retransmission) timer set, and the protocol instance shall remain in the Confirmed state. If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions back to Nothing state. If Sync is not greater than dot11RSNASAESync, and the finite cyclic group is the same as the previously received SAE Commit message, the protocol instance shall increment Sync, increment Sc, transmit its SAE Commit message and its SAE Confirm message with the new Sc value, and shall set the t0 (retransmission) timer. Otherwise, the frame shall be silently discarded."

 

And if there is support for more cleanup in the group (I doubt that, though), this could be moved to using active voice more consistently (with similar changes in other paragraphs not being part of this round; revisit in a different LB if anyone wants that elsewhere):

 

"Upon receipt of a Com event, the protocol instance shall cancel the t0 (retransmission) timer. If the Status is nonzero, the protocol instance shall silently discard the frame, shall set the t0 (retransmission) timer, and shall remain in the Confirmed state. If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and shall transition back to Nothing state. If Sync is not greater than dot11RSNASAESync, and the finite cyclic group is the same as the previously received SAE Commit message, the protocol instance shall increment Sync, increment Sc, transmit its SAE Commit message and its SAE Confirm message with the new Sc value, and shall set the t0 (retransmission) timer. Otherwise, the protocol instance shall silently discard the frame."

 

- Jouni

 

 

On Wed, Oct 6, 2021 at 11:02 PM M Montemurro <montemurro.michael@xxxxxxxxx> wrote:

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

Hello everyone,

 

At this point, we've discussed CID 116 twice in sessions and its clear there is no consensus on a resolution on the reflector. 

 

I will prepare a straw poll for this CID that we will run on the Oct 15 call. If there is no clear consensus on a resolution path, we will reject the comment. We have the entire LB and SA Ballot

process to address any underlying issues, if there are any.

 

Cheers,

 

Mike

 

On Wed, Oct 6, 2021 at 3:21 PM Harkins, Daniel <daniel.harkins@xxxxxxx> wrote:

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

 

  Mark,

 

  You have no idea what you're talking about. You don't write code and I'm unaware of any significant feature you have authored in the standard (although you have scent-marked lots of other people's contributions). You should really tone down your criticisms of other people, their opinions, and their work.

 

  Dan.

 

--

"the object of life is not to be on the side of the majority, but to

escape finding oneself in the ranks of the insane." – Marcus Aurelius

 

On 10/6/21, 11:44 AM, "Mark Rison" <m.rison@xxxxxxxxxxx> wrote:

 

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

This is the kind of thinking that results in KRACK and FragAttacks and…

 

Mark

 

--

Mark RISON, Standards Architect, WLAN   English/Esperanto/Français

Samsung Cambridge Solution Centre       Tel: +44 1223  434600

Innovation Park, Cambridge CB4 0DS      Fax: +44 1223  434601

ROYAUME UNI                             WWW: http://www.samsung.com/uk

 

From: Nehru Bhandaru <nbbrcm@xxxxxxxxx>
Sent: Wednesday, 6 October 2021 19:36
To: Mark Rison <m.rison@xxxxxxxxxxx>
Cc: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGM] Fwd: [STDS-802-11-TGM] Resolution to CID 116

 

We probably should not expand the scope of the changes for the issue, for now.

 

Also, keeping in mind that there are many existing interoperable implementations of the feature in question, it would be reasonable to assume that the implementers are able to have a consistent (and hopefully correct) interpretation of the current text, along with the corresponding state machine figures, and there would only be diminishing returns from any significant overhaul of the text.

 

Thanks,

 

- N

 

On Wed, Oct 6, 2021 at 11:08 AM Mark Rison <m.rison@xxxxxxxxxxx> wrote:

Hello Nehru,

 

> The timer is already set in the bogus/invalid case - nothing needs to be done. My comment in the email 'set(again)' is a bit lax, but the proposed text, which replaces the corresponding paragraph, is correct per my understanding (of course).

 

Ah, I see.  Then I think

Upon receipt of a Com event, if the Status is nonzero, the frame shall be silently discarded, and the protocol instance shall remain in the Confirmed state. Otherwise, If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions back to Nothing state. If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If the verification fails, the frame shall be silently discarded. Otherwise, the protocol instance shall increment Sync, increment Sc, transmit its SAE Commit message and its SAE Confirm message with the new Sc value, and set the t0 (retransmission) timer.

addresses (modulo small editorials, e.g. ", If" -> ", if",

"transitions" -> "transition", "same as" -> "same as in")

the "if … if … if not … verify … if not … if so … then …" confusion.

 

There are still the other issues with "the Status", "the frame" and

possible missing silent discard at the Del event step, but these can

be dealt with in D1.0.

 

How about 12.4.8.6.3?  This has similar problems with unclear structuring,

I think:

 

Upon receipt of a Com event, the protocol instance shall check the Status of the Authentication frame. If the

Status code is not SUCCESS, the frame shall be silently discarded and a Del event shall be sent to the parent

process. Otherwise, the frame shall be processed by first checking whether a password identifier is present.

If so and there is no password associated with that identifier, BadID shall be set and the protocol instance

shall construct and transmit an Authentication frame with Status Code set to

UNKNOWN_PASSWORD_IDENTIFIER. If there is no password identifier present or if a password is

associated with that identifier, the frame shall be processed by next checking the finite cyclic group field to see

if the requested group is supported. If not, BadGrp shall be set and the protocol instance shall construct and

transmit an Authentication frame with Status code UNSUPPORTED_FINITE_CYCLIC_GROUP indicating

rejection with the finite cyclic group field set to the rejected group, and shall send the parent process a Del

event. If the group is supported, the protocol instance shall zero the Sc and Rc counters and it shall generate the

PWE and the secret values according to 12.4.5.2 (PWE and secret generation). It shall then process the

received SAE Commit message (see 12.4.5.4 (Processing of a peer’s SAE Commit message)). If validation of

the received SAE Commit message fails, the protocol instance shall send a Del event to the parent process;

otherwise, it shall construct and transmit an SAE Commit message (see 12.4.5.3 (Construction of an SAE

Commit message)) followed by an SAE Confirm message (see 12.4.5.5 (Construction of an SAE Confirm

message)). The Sync counter shall be set to 0 and the t0 (retransmission) timer shall be set. The protocol

instance transitions to Confirmed state.

 

Thanks,

 

Mark

 

--

Mark RISON, Standards Architect, WLAN   English/Esperanto/Français

Samsung Cambridge Solution Centre       Tel: +44 1223  434600

Innovation Park, Cambridge CB4 0DS      Fax: +44 1223  434601

ROYAUME UNI                             WWW: http://www.samsung.com/uk

 

From: Nehru Bhandaru <nbbrcm@xxxxxxxxx>
Sent: Tuesday, 5 October 2021 18:57
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGM] Fwd: [STDS-802-11-TGM] Resolution to CID 116

 

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

The timer is already set in the bogus/invalid case - nothing needs to be done. My comment in the email 'set(again)' is a bit lax, but the proposed text, which replaces the corresponding paragraph, is correct per my understanding (of course).

 

I agree it would be a good idea to bring a submission, during a conf. call or something - I was merely trying to provide my input to some of your proposed changes and comments related to the issue in the email thread.

 

- N

 

p.s. FWIW the changes I proposed are no more complex than some of the other changes being discussed...

 

On Tue, Oct 5, 2021 at 10:36 AM Mark Rison <m.rison@xxxxxxxxxxx> wrote:

Hello Nehru,

 

OK, I thought we wanted to make minimal changes.  I think it would be

a good idea to show a version with change tracking, so we can see the

substantive changes.  In any case, I think it's not the case that

the retransmission timer needs to be set (again) in all cases which do not transition to the 'Nothing' state

because if a bogus/invalid Com event is received we don't transition

to Nothing but nor do we set (again) the timer.

 

Thanks,

 

Mark

 

--

Mark RISON, Standards Architect, WLAN   English/Esperanto/Français

Samsung Cambridge Solution Centre       Tel: +44 1223  434600

Innovation Park, Cambridge CB4 0DS      Fax: +44 1223  434601

ROYAUME UNI                             WWW: http://www.samsung.com/uk

 

From: Nehru Bhandaru <nbbrcm@xxxxxxxxx>
Sent: Tuesday, 5 October 2021 16:10
To: Nehru Bhandaru <nehru.bhandaru@xxxxxxxxxxxx>; Nehru Bhandaru <nbbrcm@xxxxxxxxx>; Mark Rison <m.rison@xxxxxxxxxxx>; STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGM] Fwd: [STDS-802-11-TGM] Resolution to CID 116

 

 

Hi Mark,

 

If you notice, the original text canceled the timer upon reception of the Com event. My proposed text does not do that; it just resets the timer upon successful processing/response of the

Com(mit) event. So, the timer is operational and any retries will happen if a bogus/invalid Com event is received per original schedule...

 

- N

 

On Tue, Oct 5, 2021 at 8:04 AM Nehru Bhandaru <nehru.bhandaru@xxxxxxxxxxxx> wrote:

 

 

---------- Forwarded message ---------
From: Mark Rison <m.rison@xxxxxxxxxxx>
Date: Tue, Oct 5, 2021 at 1:22 AM
Subject: RE: [STDS-802-11-TGM] Fwd: [STDS-802-11-TGM] Resolution to CID 116
To: Nehru Bhandaru <nehru.bhandaru@xxxxxxxxxxxx>, STDS-802-11-TGM@xxxxxxxxxxxxxxxxx <STDS-802-11-TGM@xxxxxxxxxxxxxxxxx>

 

Hello Nehru,

 

If

the retransmission timer needs to be set (again) in all cases which do not transition to the 'Nothing' state

then it seems to me that your latest text is not doing this in the

highlighted cases:

 

Upon receipt of a Com event, if the Status is nonzero, the frame shall be silently discarded, and the protocol instance shall remain in the Confirmed state. Otherwise, If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions back to Nothing state. If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If the verification fails, the frame shall be silently discarded. Otherwise, the protocol instance shall increment Sync, increment Sc, transmit its SAE Commit message and its SAE Confirm message with the new Sc value, and set the t0 (retransmission) timer.

 

I really think all this needs to be structured more clearly.

 

Thanks,

 

Mark

 

--

Mark RISON, Standards Architect, WLAN   English/Esperanto/Français

Samsung Cambridge Solution Centre       Tel: +44 1223  434600

Innovation Park, Cambridge CB4 0DS      Fax: +44 1223  434601

ROYAUME UNI                             WWW: http://www.samsung.com/uk

 

From: Nehru Bhandaru <00000a7a761100fa-dmarc-request@xxxxxxxx>
Sent: Monday, 4 October 2021 23:33
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGM] Fwd: [STDS-802-11-TGM] Resolution to CID 116

 

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

 

The list server rejected my message because of a proprietary..disclaimer at the end - not sure if that was inserted by me/my mail server; I will delete it and try again in case it is an artifact of replying to someone else's message with a disclaimer.

 

Thanks,

 

- N

 

---------- Forwarded message ---------
From: Nehru Bhandaru <nehru.bhandaru@xxxxxxxxxxxx>
Date: Mon, Oct 4, 2021 at 3:15 PM
Subject: Re: [STDS-802-11-TGM] Resolution to CID 116
To: Mark Rison <m.rison@xxxxxxxxxxx>
Cc: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx <STDS-802-11-TGM@xxxxxxxxxxxxxxxxx>

 

Mark,

 

I think the retransmission timer needs to be set (again) in all cases which do not transition to the 'Nothing' state. As I noted separately, that is another issue with this text - but not sure if it is related to the comment in question. Here is another take (which does not cancel the timer in the first place for the error conditions, assuming the timer has no meaning in the Nothing state and is automatically canceled as part of state transition)

 

Upon receipt of a Com event, if the Status is nonzero, the frame shall be silently discarded, and the protocol instance shall remain in the Confirmed state. Otherwise, If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions back to Nothing state. If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If the verification fails, the frame shall be silently discarded. Otherwise, the protocol instance shall increment Sync, increment Sc, transmit its SAE Commit message and its SAE Confirm message with the new Sc value, and set the t0 (retransmission) timer.

 

- N

 

On Mon, Oct 4, 2021 at 2:52 PM Mark Rison <m.rison@xxxxxxxxxxx> wrote:

Hello Nehru,

 

I think this is still ambiguous (in addition to the other issues I identified

in my previous post): what is the scope of the final sentence?  Is the intent

 

{Upon receipt of a Com event, the t0 (retransmission) timer shall be canceled. If the Status is nonzero, the frame shall be silently discarded, the t0 (retransmission) timer set, and the protocol instance shall remain in the Confirmed state. If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions back to Nothing state. If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If the verification fails, the frame shall be silently discarded. Otherwise, the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value.} AND {It then shall set the t0 (retransmission) timer.}

 

or is it

 

Upon receipt of a Com event, the t0 (retransmission) timer shall be canceled. If the Status is nonzero, the frame shall be silently discarded, the t0 (retransmission) timer set, and the protocol instance shall remain in the Confirmed state. If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions back to Nothing state. If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If the verification fails, the frame shall be silently discarded. Otherwise, {{ the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value.} AND {It then shall set the t0 (retransmission) timer.}}

 

?

 

[In my indentation-based presentation I assumed the latter was the intent,

but maybe it was the former?]

 

Thanks,

 

Mark

 

--

Mark RISON, Standards Architect, WLAN   English/Esperanto/Français

Samsung Cambridge Solution Centre       Tel: +44 1223  434600

Innovation Park, Cambridge CB4 0DS      Fax: +44 1223  434601

ROYAUME UNI                             WWW: http://www.samsung.com/uk

 

From: Nehru Bhandaru <00000a7a761100fa-dmarc-request@xxxxxxxx>
Sent: Monday, 4 October 2021 16:36
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGM] Resolution to CID 116

 

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

 

Some strikethrough and underlines do not seem to have made it through the email transport. Will try again - the below is the replacement I proposed

 

 

Upon receipt of a Com event, the t0 (retransmission) timer shall be canceled. If the Status is nonzero, the frame shall be silently discarded, the t0 (retransmission) timer set, and the protocol instance shall remain in the Confirmed state. If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions back to Nothing state. If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If the verification fails, the frame shall be silently discarded. Otherwise, the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value. It then shall set the t0 (retransmission) timer.

 

- N

 

p.s. The flow of the previous text was fine and what was needed was a clarification of the phrases 'if not', 'if so' etc- which the above text does...

 

On Sun, Oct 3, 2021 at 9:42 AM Harkins, Daniel <daniel.harkins@xxxxxxx> wrote:

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

 

  Mark,

 

  Given your hyper-sensitivity over "professional" conduct I think you should refrain from calling other

people's writing style "ambiguous rambling 'stream of consciousness'". And when you criticize other

people's writing you should at least suggest changes that are correct.

 

  I am opposed to this CID growing, which is what you seem to be doing here. Let's address the CID

and the text it is on and not use this to rewrite a section (or other sections like 12.4.8.6.3).

 

  Dan.

 

--

"the object of life is not to be on the side of the majority, but to

escape finding oneself in the ranks of the insane." – Marcus Aurelius

 

On 10/3/21, 3:33 AM, "Mark Rison" <m.rison@xxxxxxxxxxx> wrote:

 

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

I think some strikethroughs got lost (I have this trouble when I cut

and paste Word change-tracking).

 

Anyway, instead of trying to flog this dead horse, why don't we use

formatting to be clear on the sequencing?  Something like this

(I've taken one possible interpretation of the current text, but

others are possible):

 

- Upon receipt of a Com event, the t0 (retransmission) timer shall be canceled.

- If the Status [field? of what?] is nonzero, the frame [what frame?] shall be silently discarded, the t0 (retransmission) timer [shall be] set, and the protocol instance shall remain in the Confirmed state. [this should be made into an entirely active phrase "the protocol instance shall…"]

- Otherwise:

- If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions [no s] back to Nothing state. [and the frame shall be silently discarded?]

- Otherwise:

- If the finite cyclic group is not the same as [in] the previously received SAE Commit message, the frame shall be silently discarded.

- Otherwise, the protocol instance shall increment Sync, increment Sc, transmit its SAE Commit message and its SAE Confirm message with the new Sc value, and set the t0 (retransmission) timer.

 

Note that I think the ambiguous rambling "stream of consciousness" style

is also used in other locations (e.g. 12.4.8.6.3).

 

Thanks,

 

Mark

 

--

Mark RISON, Standards Architect, WLAN   English/Esperanto/Français

Samsung Cambridge Solution Centre       Tel: +44 1223  434600

Innovation Park, Cambridge CB4 0DS      Fax: +44 1223  434601

ROYAUME UNI                             WWW: http://www.samsung.com/uk

 

From: Mark Hamilton <mark.hamilton2152@xxxxxxxxx>
Sent: Sunday, 3 October 2021 00:24
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGM] Resolution to CID 116

 

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

Thanks, Nehru.  But, your suggested text seems to have gotten munged (I assume), and there are stray “Otherwise”s, or at least some problem parsing the sentences near the words “Otherwise”.

 

Mark

 

 

From: Nehru Bhandaru <00000a7a761100fa-dmarc-request@xxxxxxxx>
Sent: Friday, October 1, 2021 2:49 PM
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGM] Resolution to CID 116

 

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

There is also another issue with the text, not related to the comment though. When a Com event is received, the retransmission timer is canceled. So, a fake commit message could have the effect of canceling the timer and discarding the frame. Not sure that should be the right behavior from a security standpoint.

 

- N

 

On Fri, Oct 1, 2021 at 1:45 PM Nehru Bhandaru <nehru.bhandaru@xxxxxxxxxxxx> wrote:

There is some text in the same paragraph before the text under discussion - I took another stab and simplifying and clarifying the intended semantics without reordering the phrases (and hopefully not introducing any issues)

 

Upon receipt of a Com event, the t0 (retransmission) timer shall be canceled. If the Status is nonzero, the frame shall be silently discarded, the t0 (retransmission) timer set, and the protocol instance shall remain in the Confirmed state. If Sync is greater than dot11RSNASAESync, the protocol instance shall send the parent process a Del event and transitions back to Nothing state. If Sync is not greater than dot11RSNASAESync Otherwise, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If not the verification fails, the frame shall be silently discarded. If soOtherwise, the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value. It then shall set the t0 (retransmission) timer.

 

 

On Fri, Oct 1, 2021 at 1:33 PM M Montemurro <montemurro.michael@xxxxxxxxx> wrote:

Hi all,

 

For CID 116, we debated whether we could accept the comment and could not come to an agreement on a proposed resolution. (see the comment and discussed resolutions below) 

 

I would like to initiate a discussion on the reflector to see if we can come to a resolution.


Thanks,

 

Mike


Here is the comment:

REVme SEC adhoc comments

2554.00

12.4.8.6.5

V

SAE: "<verify X>. If not, <do Y>. If so, <do Z>" construction can be ambiguous since it is not always clear what "if so" is referring to (something in "verify X" vs. "do Y").

Replace
"If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If not, the frame shall be silently discarded. If so, the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value."
with
"If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If not, the frame shall be silently discarded. Otherwise, the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value."

 

The proposed resolution that was discussed on the call (along with an alternative that was mentioned in the chat):

 

Replace
"If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as the previously received SAE Commit message. If not, the frame shall be silently discarded. If so, the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value."

with

"If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as in the previously received SAE Commit message. If it is not, the frame shall be silently discarded. Otherwise, the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value."

Alternative:
ust a suggestion: "If Sync is not greater than dot11RSNASAESync, the protocol instance shall verify that the finite cyclic group is the same as in the previously received SAE Commit message, and if it is not, the frame shall be silently discarded. If Sync is greater than dot11RSNASAESync, the protocol instance shall increment Sync, increment Sc, and transmit its SAE Commit message and its SAE Confirm message with the new Sc value."

 

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