Code Grabber P24 Pandora D605, Keyless Go Repeaters, Car Jammers

What is a downside of keyless entry (specifically on a car) that rarely gets considered?

Passive entry systems, where someone carries a key fob in their pocket and the door unlocks when the fob approaches, are vulnerable to what is called a “relay attack.”

In a passive entry system, the car broadcasts an “are you there?” message all the time, and when the fob is in range, it replies “I’m here.” When the response message is validated, the car unlocks. The signals are relatively weak, so the fob only works close to the car.

In a relay attack, the car’s query signal is received and rebroadcast more strongly, and a more sensitive receiver picks up the key signal and rebroadcasts it to the car. Basically the key fob now works at a much longer range. This allows, for example, a car parked at a house to be unlocked by the fob inside the house, and for the car to be stolen.

Relay attacks are currently more common in Europe than the US.

Tesla has introduced a feature to thwart relay attacks by allowing the owner to require an additional PIN to drive the car.

The Tesla Model 3 doesn’t come with a key or a key fob. It pairs the owner’s smartphone with the car to drive it. There is a backup RFID card like a motel key in case the phone goes dead, or to give a valet.

Source: Quora

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