Re: AES MAC security question
From: Rein Anders Apeland (apeland_at_mivu.no)
Date: 07/03/05
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Date: Sun, 03 Jul 2005 10:19:00 +0200
On Sun, 2005-07-03 at 00:10 +0000, David Taylor wrote:
[snip]
> I'm not really sure this is a threat you're concerned about, but
> rather than stealing the car, someone could prevent you accessing
> it easily.
>
> Just monitor the transmitted packet, and send a bunch of (say 1000)
> invalid commands with a steadily increasing counter and the same
> transmitter id.
>
> Then when the owner turns up with their keyfob, they have to press
> their keyfob 1001 times before it works again.
>
Note that the receiver only increase its own transmitter-associated
counter when it receives a valid packet from a transmitter.
Say, if the last received valid packet from transmitter X had a
counter value of 4, the receiver waits for valid packets from
that transmitter with counter value 5 or more (in practice, this
means a forward window from 5 with size no more than half the max
value of the counter, preferrably a smaller window).
-- Mvh / Regards Rein Anders Apeland MIVU Solutions
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