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Key Fobs and Privacy
(lemmy.world)
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this post was submitted on 24 Mar 2025
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Privacy
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Yes it can.
The fob has no idea what it has access to, in most systems it just has a serial number. When you tap it on the reader, the reader scans its serial number. The system has a list of which key numbers are allowed to open which doors at which times, if your key matches it opens the door. These almost always have some kind of log of which key opened which door when. Whether the building management knows how to access that is anyone's guess.
If he loves in a building with fobs there's probably cameras also.
So if he's worried about after the fact investigation into his movements, he should live somewhere else.