| 摘要 |
PURPOSE: A device for restricting sub-channel information and a method thereof are provided to restrict the acquisition of sub-channel information using leaked information such as electromagnetic waves. CONSTITUTION: A repetition execution detecting unit(100) determines whether encryption calculation is executed during a fixed time. The repetition execution detecting unit determines whether an encryption calculation command is executed according to a determination result. When supplied power is blocked, a power maintenance unit(200) controls the repetition execution detection unit maintains a threshold value in the repetition detection unit during the fixed time. An encryption calculation unit(300) executes the encryption calculation according to the determination of the repetition execution detecting unit. [Reference numerals] (100) Repetition execution detecting unit; (200) Power maintenance unit; (300) Encryption calculation unit; (AA) Encryption calculation command |
