Unauthorized connection detecting device, unauthorized connection detecting system, and unauthorized connection detecting method

摘要

An unauthorized connection detecting device which detects an unauthorized charge/discharge device includes: a time information obtaining unit obtaining, as time information, information from a first charge/discharge device, the information indicating at least one of an issuing date of a first certificate which is a public key certificate and an issuing date of a certificate revocation list held by the first charge/discharge device; an expiration date obtaining unit obtaining expiration date information from a second charge/discharge device, the expiration date information indicating an expiration date of a second certificate which is a public key certificate held by the second charge/discharge device; and an unauthorization detecting unit detecting whether or not the second charge/discharge device is the unauthorized charge/discharge device by comparing the time information with the expiration date information.