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Data certification system, server device, client device, publishing server, and data certification method

  • US 9,363,411 B2
  • Filed: 04/27/2012
  • Issued: 06/07/2016
  • Est. Priority Date: 08/29/2011
  • Status: Active Grant
First Claim
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1. A data certification system comprising:

  • a server device, a client device and a publishing server in communication with one another,wherein the server device comprises;

    a server reception unit which receives raw data subject to certification of non-falsification transmitted from a client device,a proof information generation unit which generates certification information for certifying non-falsification of the raw data on the basis of the raw data received by the server reception unit, and generates proof information including the certification information and time information representing the time of the generation of the certification information, anda server transmission unit which transmits the proof information to the client device;

    wherein the client device comprises;

    a client transmission unit which transmits the raw data to the server device,a client reception unit which receives the proof information transmitted from the server device,a time information acquisition unit which acquires the time information representing the time of the generation of the certification information included in the proof information from the proof information received by the client reception unit,a report generation unit which generates report data including the time information and publishing destination information representing a publishing destination in the raw data,a transfer unit which transfers the raw data, the proof information, and the report data to the publishing server which releases the raw data, the proof information, and the report data to the publishing destination uniquely identified by the publishing destination information, andan output unit which outputs the report data generated by the report generation unit, andwherein the publishing server transmits only the report data to a first device that is in communication with the publishing destination and that cannot verify non-falsification of the report data using the raw data and the proof information, andwherein the publishing server transmits the report data, the raw data, and the proof information to a second device which is in communication with the publishing destination and which can verify non-falsification of the report data using the raw data and the proof information.

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