DIGITAL DATA CONTENT CERTIFICATION SYSTEM, DATA CERTIFICATION APPARATUS, USER TERMINAL, COMPUTER PROGRAM AND METHOD

摘要

PROBLEM TO BE SOLVED: To simultaneously certify the contents of digital data and a certificate by creating a file in which the digital data and the certificate are integrated.

SOLUTION: A data certification apparatus 1 is connected with a user terminal 2 and a timestamp imparting device 3 in a communication-enabled manner, and includes: an original data reception means for receiving the original data of a certification object from the user terminal 2; an intermediate file creation means for creating a certificate file corresponding to the original data, attaching the original data itself to the certificate file thereby creating an intermediate file; a timestamp request means for transmitting the intermediate file to the timestamp imparting device 3; a date and time guarantee information acquisition means for receiving date and time guarantee information including the hash value of the intermediate file and date and time information from the timestamp imparting device 3; a certified file creation means for embedding the received date and time guarantee information in the intermediate file and creating a certified file; and a certified file transmission means for transmitting the certified file to the user terminal 2.

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