AmbShield: Enhancing Physical Layer Security With Ambient Backscatter Devices Against Eavesdroppers

AmbShield is a security method that uses ambient backscatter devices (AmBDs, which are passive devices that reflect wireless signals without needing their own power source) to protect wireless networks from eavesdropping. The system works by having these devices act as both friendly jammers that create interference to disrupt eavesdroppers and as passive relays that strengthen the signal for legitimate users, all without requiring extra power or complex deployment.