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Signature validity extension equipment and signature validity extension methods and signature validity extension program
Signature validity extension equipment and signature validity extension methods and signature validity extension program
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机译：签名有效性扩展设备以及签名有效性扩展方法和签名有效性扩展程序
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摘要
PROBLEM TO BE SOLVED: To securely extend validity when extending the validity of an electronic document by giving an archive time stamp to the electronic document.;SOLUTION: A signature validity extension device 100 extends a validity date of signature data in such a way that a time stamp acquisition part 101 acquires a plurality of time stamps from a plurality of time stamp servers that issue different time stamps. Then, a time stamp granting part 102 grants the plurality of time stamps to signature data as a first generation archive time stamp. Thereafter, the validity date of the signature data is further extended in such a way that the time stamp acquisition part 101 acquires a plurality of new time stamps form the plurality of time stamp servers 200 and the time stamp granting part 102 grants the plurality of the new time stamps to the signature data as an m+1-th generation archive time stamp.;COPYRIGHT: (C)2010,JPO&INPIT
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