Convenience can change the security tradeoff
With passive keyless entry, a compatible car can recognize a nearby key and let you unlock it without pressing the remote. Some systems also allow the engine to start while the key stays in your pocket.
In a relay attack, equipment extends the apparent reach of communication between a vulnerable car and key. The car can be tricked into treating the key as nearby. This isn’t simply a claim that every modern key can be copied, and different systems have different protections.
Reduce the opportunity
- Store keys away from doors and windows rather than on a shelf beside the entrance.
- Use a purpose-made signal-blocking pouch or container and test whether the car can still detect the key while it is inside.
- Check whether the manufacturer allows passive entry to be disabled without disabling ordinary remote-button operation.
- Ask the manufacturer or dealer about updates and security features for your exact model.
- Consider an additional visible physical security measure where appropriate.
A metal tin isn’t a guarantee
The original 2020 post recommended a lidded metal tin. Shielding depends on its construction, seams, closure, and the frequencies involved. Test any storage method with your own vehicle instead of assuming its appearance proves it works.
Don’t put the key somewhere unsafe or rely on distance alone. Check the vehicle manual before changing settings, and remember that a spare key needs the same care.
The original article used an NFC tag, but passive keyless-entry relay attacks aren’t all NFC-based. Identify the actual system rather than treating those terms as interchangeable.
