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What security purpose a Faraday bag has when it contain a vehicle keyfob
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this post was submitted on 21 Jan 2025
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fobs don't turn off. but the car sends a signal to the fob, the fob responds in kind. fobs don't constantly transmit
the farraday cage blocks the intial signal sent by the car. Or as already noted; by the guy standing near enough to get it. (frequently still outside the house.) who then relays it to a guy in/at the car.
Yes I simplified. Some(? I’d hope all but probably not) new fobs do turn off (ignore the car broadcast) if they are not moved for a time. I proved this to myself with my 2020 car by putting my keys down by my car door, I could only unlock the car for a minute or two after I put it down, after that keyless entry didn’t work until I disturbed the fob to wake it up.
This is to mitigate the relay attack at home (and I’m sure other times, like if the key is in a purse), one avenue was that attackers would count on people hanging their keys by the door, so accessible to selective standing on the stoop with a relay. By turning off at rest they can’t be exploited this way.
That's clever. I did not know that some key fobs have motion detection as a security feature.