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Apparatus and program for update of time stamp

  • US 20070106912A1
  • Filed: 10/26/2006
  • Published: 05/10/2007
  • Est. Priority Date: 11/04/2005
  • Status: Active Grant
First Claim
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1. An apparatus for update of a time stamp, the apparatus being able to certify certification target data on the basis of time stamp data transmitted from an apparatus for time stamp authority, the apparatus comprising:

  • an evidence data storage unit configured to relate the certification target data to the time stamp data and to save the related certification target data and time stamp data;

    a time stamp obtaining unit configured to transmit hash value calculated from seal target data including the time stamp data that has already been related to the certification target data to the apparatus for time stamp authority according to a certain prescribed timing, to receive time stamp data to the seal target data from the apparatus for time stamp authority, to relate the obtained time stamp data to the certification target data, and to store the related time stamp data and the certification target data in the evidence data storage unit; and

    a time stamp verification unit configured to calculate logical OR of a validity period of the time stamp data related to the certification target data, and to output a period that can go back from time of verification as a period when the certification target data can be certified.

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