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This seems mildly dystopian (lemmy.world)

submitted 2 days ago by [email protected] to c/[email protected]

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[–] [email protected] 0 points 1 day ago

Yeah, they used something like fluctuations in the WiFi signal, so you can turn it off. I suppose they could broadcast secretly without an SSID, but there are apps that will show it, so I doubt they would.

They can also see more than just movement: https://www.popularmechanics.com/technology/security/a42575068/scientists-use-wifi-to-see-through-walls/

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