Apparatus and program for update of time stamp
First Claim
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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Accused Products
Abstract
A time stamp updating apparatus includes: a time stamp obtaining unit configured to transmit hash value calculated from certification target data to an apparatus for time stamp authority when certification target data is input, to receive time stamp data from the apparatus for time stamp authority, to relate the received time stamp data to certification target data, and stored them in an 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 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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Citations
12 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer executable program for update of a time stamp, the computer executable program being able to certify certification target data on the basis of time stamp data transmitted from an apparatus for time stamp authority, the computer executable program comprising:
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in an evidence data storage unit, relating the certification target data to the time stamp data and saving the related certification target data and time stamp data;
in a time stamp obtaining unit, transmitting 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, receiving time stamp data to the seal target data from the apparatus for time stamp authority, relating the obtained time stamp data to the certification target data, and storing the related time stamp data and the certification target data in the evidence data storage unit; and
in a time stamp verification unit, calculating logical OR of a validity period of the time stamp data related to the certification target data, and outputting a period that can go back from time of verification as a period when the certification target data can be certified. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification