Abstract: An Internet of Thing (IoT) device generates a first response value corresponding to a previously registered first challenge value by using a WPUF, generates a current session key based on the first response value, transmits the current session key to an authentication server by encrypting the current session key into a first random number, receives, from the authentication server, some of a previously registered CRP transmitted by the authentication server as the authentication server authenticates the IoT device based on the first random number and the session key and a second random number, generates a second response value corresponding to a second challenge value, among the some of the CRP, by using an RPUF, authenticates the authentication server by comparing the second response value with the some of the CRP, and then updates the session key, the second challenge value, and the second response value for a next session.

Abstract: Provided are an electronic device and an operating method thereof. When a predetermined event occurs while contents are being output, a video and a sound of the contents are controlled to be respectively output through different electronic devices, thus improving a content provision environment for a user.