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There's a subtle difference. With the physical key you can't do anything remotely, with a copy of the proposed crypto key you can.

Remote control over your breaks/steering is a pretty scary scenario. Someone having your physical keys mostly means they can steal your car.




This is a strange thing to worry about: the former owner of your used car planning to murder you? I'm perfectly fine with the answer that, as with most technology, it's nearly impossible to prove your car computer hasn't been backdoored.


How about the former owner of your used car taking control of it to drive it to the next potential buyer, eliminating you in the process.




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