Wi-Fi can accurately identify people, even if they aren't carrying a phone or computer

Researchers discovered that Wi-Fi routers supporting Wi-Fi 5 or newer can accurately track people even without devices, using a technique called beamforming to create radio-based "images." The BFId attack identified 197 participants with nearly 100 percent accuracy by analyzing how bodies disrupt Wi-Fi signals. Since most current Wi-Fi devices support these standards and signals are unencrypted, this surveillance method could be deployed almost anywhere, raising significant privacy concerns.