The systems offered by car manufacturers seem to work pretty well. My car
has an RF chip in the key. It doesn't matter what you do, the car is not
going to start unless you have one of the trusted keys, and making it
accept a new trusted key requires you to have two already trusted keys.

Not to mention the sensors on doors and trunk that can tell if it's a key
opening the car as opposed to something else.

Added bonus: insurance discount for having factory anti-theft rather than
add-on.

But I suppose if you get your jollies fantasizing about how you're going
to take revenge on evildoers, your system has the edge.

-Bob

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