UPDATE INFORMATION GENERATING DEVICE, IDENTIFICATION INFORMATION UPDATING SYSTEM, IDENTIFICATION INFORMATION UPDATING METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an update information generating device and the like which can accurately specify a user having an updated ID even when an encryption key is updated during the generation of the ID by encryption processing. SOLUTION: The update information generating device receives a connection request to a service providing server from a user terminal and refers to a connection history to confirm whether there is the connection history, and when the connection history is present, the update information generating device confirms whether an encryption key used for encryption processing when a service is used last time is older than a current encryption key. If the encryption key used for the encryption processing when the service is used last time is older than the current encryption key, encryption processing is performed using both the current encryption key and old encryption key to generate two pieces of service use identification information, which are transmitted to the service providing server to instruct the service providing server to update the old service use identification information into the new service use identification information. COPYRIGHT: (C)2008,JPO&INPIT