RADIUS attribute from rfc7268

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WLAN-Group-Mgmt-Cipher

The WLAN-Group-Mgmt-Cipher Attribute contains information on the
      group management cipher used to establish the robust security
      network association (RSNA) between the AP and mobile device.

      Zero or one WLAN-Group-Mgmt-Cipher Attribute MAY be included
      within Access-Request and Accounting-Request packets.  The
      presence of the Attribute indicates that the Station negotiated to
      use management frame protection during association.

      A summary of the WLAN-Group-Mgmt-Cipher Attribute format is shown
      below.  The fields are transmitted from left to right.

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |  Length       |     Value
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                 Value                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      189

   Length

      6

   Value

      The Value field is four octets, containing a 32-bit unsigned
      integer, in Suite selector format as specified in Figure 8-187
      within Section 8.4.2.27.2 of , with values of OUI and
      Suite Type drawn from Table 8-99:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                OUI                            |  Suite Type   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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