Re: AES MAC security question

From: Joseph Ashwood (ashwood_at_msn.com)
Date: 07/04/05 

Date: Mon, 04 Jul 2005 01:43:30 GMT

"Rein Anders Apeland" <apeland@mivu.no> wrote in message
news:1120430800.5120.83.camel@localhost.localdomain...
>> What protects against a man-in-the-middle attack?
>
> Could you give some examples? I do not claim to be a crypto-expert,
> but would like a discussion on my planned solution. :D

This attack would be:
I sit outside your house waiting for your kid to play with your key fob (or
I just leave a receiver).
Before you head to work in the morning I playback all the received data for
your car in the hopes that one of them unlocks and starts it.
I drive away in your car.

This is a fairly classic man-in-the-middle (MITM) attack. Without 2-way
communication or a third party (e.g. clock) it is impossible to prevent.
                    Joe

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