• partial_accumen@lemmy.world
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    5 months ago

    Couldn’t a Model 3/Y owner also just disable the phonekey and use the NFC cards? NFC only broadcasts a few inches right? I would think that would be VERY hard for a malicious actor to capture with relay/replay attack.

    Following that, is it possible to use the Phonekey only in NFC mode or is it always broadcasting on Bluetooth LE and NFC?

    • digdug@kbin.social
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      5 months ago

      I just tried this a couple different ways:

      1. Removing permission for “nearby devices” - this unfortunately appears to block both Bluetooth and NFC permission
      2. Turning off the phone’s Bluetooth - NFC still works while the Bluetooth radio is off, but you’d basically never be able to safely use Bluetooth anytime you aren’t watching your car. Setting a PIN is still unfortunately the only way to go, and hope that a dedicated attacker doesn’t also find a way to capture your PIN (e.g. camera zoomed in on your screen).
      • partial_accumen@lemmy.world
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        5 months ago

        So we’d need Tesla to push a software change in the app with an option to turn off the Bluetooth LE signal, but leave the NFC on to continue to use Phonekey safely.

        I guess the only safe alternative is using the NFC cards.