They explicitly went into the advantages over cameras:
- Any light condition (of course IR lighting with IR cameras are the gold standard so this can argueably be met otherwise)
- The ability to cover multiple rooms through walls with a device. A sub-10 GHz signal can penetrate most interior walls. People could be tracked without even being able to see a camera and by extension not knowing where to mess with to defeat surveillance.
So perhaps a building takes a picture of everyone as they come in the front door and also establishes a ‘WhoFi’ profile for that person. They could keep track of their movement through the building while maintaining an actionable correlation to a photo.
voodooattack@lemmy.world 1 week ago
First 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.