DATA CERTIFICATION SYSTEM, SERVER DEVICE, CLIENT DEVICE, PUBLISHING SERVER AND DATA CERTIFICATION METHOD

摘要

In the present invention, integrity of output data is validated without using the device that issued proof information, said proof information being used for certifying the integrity. A proof information generation unit generates certification information for certifying the integrity of raw data and generates proof information that includes the certification information and the time of the generation of the certification information. A server transmission unit transmits the proof information to a client device. A client reception unit receives the proof information transmitted from the server device. A time information acquisition unit obtains the time information from the proof information, said time information indicating the time of the generation of the certification information. A report generation unit generates report data in which the time information and publishing destination information that indicates a publishing destination are included in raw data. A transfer unit transfers the raw data, the proof information, and the report data to a publishing server that releases the report data. An output unit outputs the report data.