A method for activating a physiologic sensor (124) of a peripheral device (104) of a monitoring apparatus (100) includes receiving, at the peripheral device (104), a signal indicating a host device (102) authenticated the peripheral device (104), receiving, at the peripheral device (104), a host device authentication response signal, authenticating, at the peripheral device (104), the host device (102) based on the host device authentication response signal, and activating the physiologic sensor (124) of the peripheral device (104) in response to authentication of both the host and peripheral devices (102, 104).