SECURITY DEVICE, TIME CALIBRATION DEVICE, TIME STAMP DEVICE, POWER SUPPLY CONTROL METHOD AND POWER SUPPLY CONTROL PROGRAM

摘要

PROBLEM TO BE SOLVED: To prevent the time from being altered by a malicious user and to restrain power consumption during the stock period and the operating period.

SOLUTION: A time correction processing part corrects the local time according to the radio time, when a predetermined condition is satisfied, and a time calibration processing part acquires the authentication time from a time issuing device to calibrate the local time. A power supply control part controls the power supply to components other than an authentication key storage part, whereby when transition from a pause mode to an operation mode occurs, the time calibration processing part acquires the authentication time from the time issuing device to calibrate the local time, and further the power supply control part supplies power depending upon no-use period.

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