A question on WPA
jkmaline at cc.hut.fi
Sat Oct 2 01:00:06 EDT 2004
On Fri, Oct 01, 2004 at 08:33:23AM -0700, J I wrote:
> I wanted to know if the message 1(from the Authenticator) of the group handshake is tkip encrypted using the PTK installed in fourway handshake.
> Further, in case the Authenticator restarts the Four way handshake again after recieving a MIC failure report from the supplicant, are the messages in such a four way handshake are TKIP encrypted using the previously installed PTKs.
Yes, WPA EAPOL-Key packets are encrypted whenever PTK is available. In
this case, the previously installed PTK is used until the end of the new
4-Way Handshake assuming this MIC failure report did not trigger TKIP
countermeasures (which would remove the old PTK).
Jouni Malinen PGP id EFC895FA
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