Driver loses his car to hackers. TWICE. – Naked Security

This is probably the most telling part of the whole article - new therefore good!

"There is yet another relay-attack-thwarting, authentication-token-based technology that we believe may have been invented or at least rediscovered by Naked Security’s Paul Ducklin:

Put a slot in the car into which you have to insert a metal authentication token cut into a unique shape, and then turn it to the left or right to prove your presence…"