| 摘要 |
A time stamp apparatus that carries out e-signature including local time based on the local time output from an internal clock, includes an authentication time requesting unit that requests a time publishing apparatus for publishing an authentication time synchronous with standard time to publish the authentication time, an authentication time acquiring unit that acquires the authentication time published by the time publishing apparatus, a delay time calculating unit that calculates delay time included in the authentication time based on response time during which the authentication time requesting unit requests the publication and the authentication time acquiring unit acquires the authentication time, and a time correcting unit that corrects the local time using the authentication time based on the delay time calculated by the delay time calculating unit.
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