Re: [STDS-802-11-TGM] TGmc CID 13

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I must admit I'm mildly confused:

1) 11.6.1.4 Group key hierarchy says that the size of the GTK is

256 + TK_bits, where TK_bits is in Table 11-4

2) So the size of the GTK is 32+5 octets for WEP-40, 32+13 octets

for WEP-104, 32+32 octets for TKIP and 32+16 octets for CCMP/BIP,

right?

3) So if the thing being distributed is the GTK (rather than the TK,

which does have a size of TK_bits, as the name suggests):

a) In F8-489, the Key subfield should have a size of 32+5, 32+13,

32+16 or 32+32 octets

b) The value of the Length field below should be 11+32+5, 11+32+13,

11+32+16 or 11+32+32 (except that I hope/think we've managed to agree

to delete such sentences)

4) Similarly in F8-490, the Key subfield should have a size of

32+16 and the Length value should be 8+32+16

No?

Mark

Mark RISON, Systems Architect, Wi-Fi English/Esperanto/Français

Samsung Cambridge Solution Centre Tel: +44 1223 434600

Innovation Park, Cambridge CB4 0ZT

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

From: ***** IEEE stds-802-11-tgm List ***** [mailto:STDS-802-11-TGM@xxxxxxxx] On Behalf Of Dorothy Stanley
Sent: 13 December 2012 18:16
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGM] TGmc CID 13 - Proposed resolution

--- This message came from the IEEE 802.11 Task Group M Technical Reflector --- Per my Dec 7 telecon action item, the proposed resolution for CID 13 (below) is:

Revised:
Below figure 8-489, Insert the following paragraph sentence immediately following the paragraph describing the RSC field and
Before the paragraph beginning “NOTE—The RSC field value for TKIP”:

“The Key field is the GTK being distributed.”

Also, it has been noted that the Figure 8-489 Length description
field is missing the CCMP key case (16 octet key; only 5 octet and 32 are shown).

Change the Length field description sentence as shown below:

The value of the Length field is 16, 27 or 43.

Thanks,

Dorothy
------------------

790.30

8.5.14.19

(For Diane Lacey, 802.11-2012 publication editor)
Ed writes: 'Figure 8-489 re Key field: Do we want to add paragraph about this field after paragraph for RSC field? (see discussion after Figure 8-490 for IGTK subelement)'

Add para defining contents of Key Field for WNM-Sleep Mode GTK subelement

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Re: [STDS-802-11-TGM] TGmc CID 13 - Proposed resolution