When you use your phone to unlock a Tesla, the device and the car use Bluetooth signals to measure their proximity to each other. Move close to the car with the phone in hand, and the door automatically unlocks. Move away, and it locks. This proximity authentication works on the assumption that the key stored on the phone can only be transmitted when the locked device is within Bluetooth range.
Now, a researcher has devised a hack that allows him to unlock millions of Teslas—and countless other devices—even when[...] Continue reading @ arsTECHNICA
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