WPA/WPA2 key renewal

[Motonori Shindo]

Jouni,

Sorry, I have pushed a "send" button by mistake before I write up
something.

Is the rekeying you are talking about here is initiating a 4-way
handshake to derive a new PTK out of the PMK? 

Regards,

From: Jouni Malinen <j at w1.fi>
Subject: Re: WPA/WPA2 key renewal
Date: Wed, 24 Feb 2010 08:18:19 +0100

> On Tue, Feb 23, 2010 at 01:41:50PM -0800, Dmitry Shmidt wrote:
> 
>> Is there any way to figure out when AP will do key WPA/WPA2 renewal?
> 
> Figure it out where and when? The associated station will know when this
> process started, but it does not know when the AP might do it in the
> future. It can also request the AP to do rekeying immediately.
> 
>> I am looking at packet trace and I can not find any information related to this.
>> Is it not "public"? I mean that AP is not sending it at all?
> 
> The rekeying handshake is encrypted, so it can get somewhat difficult to
> figure this out from a capture trace. In most cases, you can probably
> figure it out by checking packets lengths and timing for a frame
> exchange between the AP and the station.

---
Motonori Shindo
Chief Technology Officer
Fivefront Corporation
http://www.fivefront.com