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Comment on Humans can be tracked with unique 'fingerprint' based on how their bodies block Wi-Fi signals

The resulting image must just basically look like a shadow, I can’t imagine that they’re going to get much internal detail with Wi-Fi considering that my router’s signal practically gets blocked by a piece of cardboard.

This research essentially amounts to, humans can be individually identified with nothing more than low quality x-rays. Well yeah, so what, you can also use visible light and in any situation where you’re going to use Wi-Fi to detect someone, it’s got to be easier to buy a cheap CCTV camera.

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Goretantath@lemmy.world ⁨8⁩ ⁨months⁩ ago
When they send a drone to your house they can make sure exactly where you are so they can shoot you through the wall.

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jj4211@lemmy.world ⁨8⁩ ⁨months⁩ ago
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.
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voodooattack@lemmy.world ⁨8⁩ ⁨months⁩ 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.

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- leburb@sopuli.xyz ⁨8⁩ ⁨months⁩ 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.”
  
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  - voodooattack@lemmy.world ⁨8⁩ ⁨months⁩ 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.
    
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douglasg14b@lemmy.world ⁨8⁩ ⁨months⁩ ago
Given your in-depth knowledge of Wi-Fi to consider it blocked by cardboard, I somehow doubt the rest of this comment is credible…

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