Comment on Humans can be tracked with unique 'fingerprint' based on how their bodies block Wi-Fi signals
voodooattack@lemmy.world 1 week agoFirst of all: cardboard does NOT block electromagnetic waves. You need a Faraday Cage for that. And even then, it has to have holes of a certain size to block specific wavelengths/frequencies. It’s why you have a mesh on the door of your microwave for example.
Secondly: they’re not attempting to photograph you. Just identifying your unique signature once would allow them to track your location anywhere where they have the gear installed.
leburb@sopuli.xyz 1 week ago
It doesn’t have to have holes to block radiation. A continuous sheet blocks all frequencies. A mesh is just nice so we can see through the cage or allow air to pass etc.
From the page you linked: “A Faraday shield may be formed by a continuous covering of conductive material.” “… if the conductor is thick enough and any holes are significantly smaller than the wavelength of the radiation.”
voodooattack@lemmy.world 1 week ago
My bad, a Farady Shield works just as well and it doesn’t need holes. But I was thinking about ways to combat this while posting and a solution involving conductive fabric was going through my head in that moment.