Abstract: Applications for physical layer security are disclosed. One such application is a system comprising a medical sensor device and a wireless communication module. The medical sensor device is operable to generate data representative of a condition of a patient. The wireless communication module is operable to transmit, on a wireless communication channel, the generated data representative of the condition of the patient. The system also includes a physical layer security module residing at a physical layer of the wireless communication module. The physical layer security module is operable to provide a secrecy zone around the physical layer security module by transforming the generated data such that transmission of the generated data is secured from interception by an eavesdropper on the wireless communication channel.