3 ms·

Why don't they put an on-off switch on the fob? Better yet, when the vehicle locks, send a turn-off signal to the fob. Then you'll have to press a power button

• Xylakant 9y ago
  That's running exactly contrary to the feature that's implemented and abused: The car should unlock when the owner comes within radio distance. So the key must be on and transmitting - and it's that signal that gets relayed. It's not a replay attack, basically the signal just gets amplified to trick the car into believing that the key is close.
  • moioci 9y ago
    Right, so when you put the fob in your pocket to leave, you activate it, and it stays active until you've completed your trip and you lock the car. But while it's resting on your nightstand or kitchen counter, it's inactive. Or is there something I'm missing?