Well, that snapshot doesn’t really get to the heart of it, Of course Wi-Fi can identify you if you’re carrying a phone. Now it turns out that it can also do so even if you’re NOT.
Wi-Fi devices communicate with each other by exchanging so-called Beamforming Feedback Information (BFI). These feedback signals show how radio waves propagate throughout a room and are sent unencrypted from connected devices to the Wi-Fi router.If a person moves through this Wi-Fi field, their body causes measurable changes to the Wi-Fi signals. Artificial intelligence can then analyze the data and signal changes well enough to associate it with an individual—with a nearly 100 percent accuracy rate.
In a study involving 197 test subjects, the researchers were able to reliably identify people regardless of their walking style or perspective. Even objects like bags and boxes had little influence on the results.
And you were worried about sharing your Thanksgiving pictures of the kids with Aunt Molly on social media. Ha!