I see many people speculate how the cars are being hacked. In addition to listed attacks there's even easier one and harder to protect against. You basically n

I see many people speculate how the cars are being hacked. In addition to listed attacks there's even easier one and harder to protect against. You basically need two people, one one carries a device and is close to the car. The other wears an antenna and tries to get close to the car owner. They relay information over radio. They basically use owner's key to open the car. I'm wondering if this problem could somehow be solved on cryptographic level. But even then I would love if manufacturers would simply provide a switch on the key, which simply turns off the keyless feature.