Tesla's already have NFC unlock, the fob and the card can both be used to unlock using NFC by placing them on at top of the B pillar.
The problem is that people love proximity unlock, i.e car unlocks before you reach it and you don't need to place any device directly on/very close to the surface of the car. To do this requires Bluetooth and usually multiple BT radios such that you can perform ranging (can be augmented with UWB etc) to determine if the owner is approaching or moving away from the car etc.
Because of the timings involved it's easy to perform relay attacks as described in the article and it's a non-trivial problem to solve without impeding on the core user experience (which is to be able to simply walk up to the car).
I think the only viable solution is probably to add some sort of gait/build/facial detection into the Sentry system that needs to obtain confirmation before BT unlock is processed but that seems pretty damn hard and I don't even know if it could reach the accuracy required to thwart attacks.
The problem is that people love proximity unlock, i.e car unlocks before you reach it and you don't need to place any device directly on/very close to the surface of the car. To do this requires Bluetooth and usually multiple BT radios such that you can perform ranging (can be augmented with UWB etc) to determine if the owner is approaching or moving away from the car etc.
Because of the timings involved it's easy to perform relay attacks as described in the article and it's a non-trivial problem to solve without impeding on the core user experience (which is to be able to simply walk up to the car).
I think the only viable solution is probably to add some sort of gait/build/facial detection into the Sentry system that needs to obtain confirmation before BT unlock is processed but that seems pretty damn hard and I don't even know if it could reach the accuracy required to thwart attacks.