Sean Robertson retweetledi

German researchers at KIT have demonstrated a system that turns standard home and office WiFi routers into powerful surveillance tools — without cameras, phones, or any devices on the person.
By analyzing how WiFi signals bounce off the human body (body shape, gait, posture, even a backpack), their AI model achieved nearly 100% accuracy identifying individuals among 197 test subjects.
It works through walls. In the dark. Even if you're not connected to the network.
This isn't sci-fi. It's happening with the routers already in your house right now.
The privacy implications are enormous. Every coffee shop, office, apartment building, and airport could potentially become a tracking system. One researcher warned this technology effectively turns every router into a potential surveillance device.
We’re entering an era where your unique “WiFi shadow” could identify you anywhere there’s wireless internet.
[Julian Todt, Felix Morsbach, Thorsten Strufe. BFId: Identity Inference Attacks Utilizing Beamforming Feedback Information. CCS ’25: Proceedings of the 2025 ACM SIGSAC Conference on Computer and Communications Security, 2026, DOI: 10.1145/3719027.3765062]

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