Patent ID: 8145194
Filing Date: 2012-03-27
Classification: G06F,H04L,H04W

Abstract:
1. An electronic apparatus comprising: a receiver for intermittently receiving a first wireless signal and a second wireless signal from a counterpart electronic apparatus; a distance detector for executing a distance detection processing for detecting whether or not a distance to the counterpart electronic apparatus exceeds a predetermined threshold distance based on a received level of the received first wireless signal; an authentication unit for executing an authentication processing for authenticating the counterpart electronic apparatus by judging whether or not authentication data included in the received second wireless signal is predetermined authentication data; and a controller for (i) determining whether or not a true counterpart electronic apparatus is present within the predetermined threshold distance by repeatedly executing the distance detection processing and the authentication processing continuously at a first communication interval and a second communication interval, respectively, and (ii) executing one of a processing of outputting an alarm signal and a predetermined control processing when the true counterpart electronic apparatus is not present within the predetermined threshold distance, wherein, when a first communication time for the distance detection processing is shorter than a second communication time for the authentication processing, the first communication interval is set to be shorter than the second communication interval, wherein the authentication data is encrypted authentication data, and wherein the authentication unit decodes the encrypted authentication data included in the received second wireless signal from the counterpart electronic apparatus using a predetermined decoding key, and obtains the authentication data.