An electronic device includes a biomedical sensor configured to generate a first signal by detecting a biomedical signal, a motion sensor configured to generate a second signal by detecting a motion, and a communication interface configured to provide a secure communication channel with another electronic device, and receive a third signal through the secure communication channel. The electronic device further includes a controller configured to generate a secret key for the secure communication channel, based on the first signal, and determine whether to perform a predetermined function, based on the second signal and the received third signal.