Re: AES MAC security question

From: Colin Andrew Percival (cperciva_at_sfu.ca)
Date: 07/03/05 

Date: Sat, 2 Jul 2005 23:55:18 +0000 (UTC)

Kristian Gj?steen <kristiag+news@item.ntnu.no> wrote:
> If the adversary has say 3600 attempts per hour, an adversary that
> keeps at it for a year has probability roughly 0.007 of winning.
> I could live with that.

As long as each attempt only applies to a single car, yes. If someone
can drive into a large parking lot and start broadcasting "unlock
yourself and flash your lights" (encrypted with a series of keys) to a
large number of cars, it might become more problematic.

Colin Percival