Time management apparatus and time management method

Details Time management apparatus and time management method Time management apparatus and time management method

2005-02-22

2009-06-30

Song, Hosuk (Department: 2435)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S178000

Reexamination Certificate

active

07555651

ABSTRACT:
It is an object of the present invention to provide a time management apparatus and a time management method for reducing the opportunity for a third party to intentionally tamper with time. In order to achieve this object, the present invention is provided with time management apparatus including an external time fetching part for fetching an external time within a predetermined time span, a local clock part for outputting a self-advance time, and a time difference judgment part for calculating a difference between the external time fetched by the external time fetching part and the self-advance time output by the local clock part, setting the external time to the local clock part in a case where the difference is less than a predetermined value, and not setting the external time to the local clock part in a case where the difference is equal to or more than a predetermined value.

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