wAuth: Wireless Biometric Signatures for Robust and Ubiquitous Authentication in IoT Environments

Achieving reliable and ubiquitous user authentication in IoT environments remains difficult, as many existing methods face security weaknesses, privacy concerns, or rely on specialized sensors. We introduce wAuth, a cameraless wireless biometric authentication framework that leverages Wi-Fi Channel State Information (CSI) to authenticate both devices and users. wAuth operates in three phases: (1) wHash generation from wireless channel dynamics for device trust; (2) wBioHash extraction from CSI-based biometric and behavioral features; and (3) access-point verification for final authorization. By transforming ambient Wi-Fi signals into unique signatures, wAuth provides seamless, privacy-preserving authentication and strong resistance to spoofing and interference, enabling secure access across interconnected IoT systems.