MANAGEMENT SERVICE DEVICE, BACKUP SERVICE DEVICE, COMMUNICATION TERMINAL DEVICE, AND STORAGE MEDIUM

摘要

There are provided a method for invalidating a storage medium and performing new registration, a method for backup of data stored in a storage medium and restoring the backup data into the storage medium, and a method for verifying the encryption and the digital signature of the data to be backed up and decryption and the digital signature of the backup data to be restored. A service device includes: a reception unit for receiving a data processing request concerning the storage medium from a communication terminal device connected to a storage medium; an authentication unit for authenticating the storage medium connected to the communication terminal device; and a database containing the public key of the storage medium. When the reception unit has received a request for invalidating the first storage medium from the communication terminal device and the authentication unit has authenticated that the second storage medium connected to the communication terminal device is an authorized storage medium, the database deletes the public key of the first storage medium.