| 摘要 |
Specific information that can be stored in a mobile terminal device, changes over time, cannot be altered when a lock operation is requested, and can be acquired by an owner, such as a last-dialed telephone number, is managed as owner-specific authentication information, and, when an e-mail requesting a lock operation is extracted, a lock number for authentication for locking the mobile terminal device is calculated by using the owner-specific authentication information as a parameter.
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