"Unsupported TKIP Group Cipher key length"

Jouni Malinen jkmaline at cc.hut.fi
Tue May 31 22:34:37 EDT 2005

On Wed, Jun 01, 2005 at 01:06:10AM +0200, Eric wrote:

>   I'm trying to get WPA working on my Livebox modem/router and a
> madwifi card + wpa_supplicant.
> I'm getting these messages from wpa_supplicant:
> WPA: RX message 1 of Group Key Handshake from 00:0e:9b:99:1a:38 (ver=1)
> WPA: Unsupported TKIP Group Cipher key length 13 (13).

This sounds like the AP would be advertising that TKIP is used as a
group cipher but the key length sounds more like something for WEP..
Could you please send the full debug log from wpa_supplicant?

> I haven't been able to find any info on this type of error. Is it the
> client or the AP's fault?

How is the AP configured? Are there any options on selecting the group
cipher or something like "allow non-WPA clients"? I haven't seen any AP
doing something that would produce this kind of debug message and it
looks likely that the AP is doing something incorrectly. wpa_supplicant
supports WEP as a group cipher, but that would require that the WPA IE
is advertising WEP, not TKIP..

Jouni Malinen                                            PGP id EFC895FA

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