Individuals Can Be Identified And Tracked By Wi-Fi Signals
February 11th, 2026Via: PC World:
As if you didn’t have enough to worry about when it comes to surveillance, researchers have discovered a new way to identify and track people using Wi-Fi signals—and I’m not talking about anything relating to your electronic devices. This tech can identify a specific, individual person, and track them in a physical space and across locations, based on how their body interacts with Wi-Fi signals.
“WhoFi,” a system developed by researchers at La Sapienza University of Rome, makes me think of that one “sonar” scene from The Dark Knight. And to be sure, tracking the way wireless electronic signals interact with the physical world isn’t anything new—almost a decade ago they figured out how to make a 3D map of a building using Wi-Fi. But this new system can “fingerprint” individual people (or at least their bodies), track them in physical space, and re-identify them in the same or a different location, based on the way Wi-Fi signals bounce off and through them.
Similar attempts have been made as recently as 2020, but only achieved a 75 percent accuracy, which wasn’t good enough for true surveillance. According to the research paper (spotted by The Register), the WhoFi system can be up to 95.5 percent accurate when used with its neural network. This setup could beat conventional identification with cameras in many ways, as it isn’t affected by light conditions and can “see” through walls and other physical objects.
The implications are staggering, given the ubiquity of Wi-Fi in nearly every public and private space. A fairly innocuous but still creepy use might be a system that determines when a specific customer returns to a store and texts them a coupon as a “welcome back” present. A far more sinister application would be simply tracking where a person goes and when, including private residences, if the Wi-Fi data were sold or otherwise obtained. It goes without saying that government agencies would be extremely interested in getting access to that data.
More:
The Spy Who Came in from the WiFi: Beware of Radio Network Surveillance
BFId: Identity Inference Attacks Utilizing Beamforming Feedback Information
