3 ms·
So the encryption is not solving it then. But I may need to add to my original post: - Relay attacks can theoretically be solved with high precision clocks, bu
by LeonM 4y ago
So the encryption is not solving it then. But I may need to add to my original post:
- Relay attacks can theoretically be solved with high precision clocks, but will affect price and reliability in a negative way
This obviously depends a bit on the situation, but most relay attacks happen within reasonable proximity. Most attacks happen to a car parked in front of a house, since the attacker knows that the keyfob is likely to be within the house. The distance here is often less than 20m. To get reasonably reliable relay detection on these kinds of distances, you'll need very precise clocks, which will make the keyfobs expensive and still increases the risk of false positives on relay detection.
What's the point (to the customer) if the expensive ULTRA SECURE (tm) keyless entry system is 10x the price, and still less reliable than the keyless entry system om their 20 year old Toyota?
- zormino 4y agoFor lots of modern cars, the users phone is a key, and the car itself is connected, so you could also theoretically share and compare gps location during the unlock attempt.
- drcongo 4y agoI'm no expert, but I'm pretty sure GPS isn't going to have the accuracy needed to prevent a relay attack.
- Merad 4y agoI think the accuracy should be fine, cell phones typically have a GPS accuracy of 5-10 m. The problem is that you won't be able to rely on it. You probably won't have any GPS signal at all in an underground parking garage, and even in an above ground parking deck you will likely have poor or no signal due to being surrounded by steel and concrete.
- drcongo 4y agoIt takes a pretty sustained period of polling to get to 5-10m accuracy though right?