It's aggravating, because even this kind of attack is easy to defend against. If the keyless entry system receives, say, five bad signals in a second, just go to sleep for five seconds. Makes brute force impractical.
The radio wave is sent from a remote to a surrounding area though.
IF many cars were on the same frequency, any time more than a few dozen people (think after sporting events) it could easily be possible that you'd get one of these delays; if you get it, and press it again you start the timer over for every car in your rf range.
Also, think of the issue @ the dealer.
Now, if two hashes were sent, the vehicle address and the next security hash, then this lockdown mode works.
This is easily (and almost certainly already) solved with pairing the key to the car, so that the car can safely ignore any unlock attempt by another (legitimate) key.
IF many cars were on the same frequency, any time more than a few dozen people (think after sporting events) it could easily be possible that you'd get one of these delays; if you get it, and press it again you start the timer over for every car in your rf range.
Also, think of the issue @ the dealer.
Now, if two hashes were sent, the vehicle address and the next security hash, then this lockdown mode works.