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Originality guarantee system, embedded information/alteration detection apparatus and embedded information/alteration detection method, and record medium storing embedded information/alteration detection program therein

  • US 20040255125A1
  • Filed: 03/24/2004
  • Published: 12/16/2004
  • Est. Priority Date: 03/26/2003
  • Status: Active Grant
First Claim
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1. An originality guarantee system, comprising:

  • an embedded information apparatus which embeds information into a plurality of structural data comprises;

    and includes a data standardization device that sorts the plurality of structural data on the basis of a first rule, a message digest generation device that calculates a message digest with a predetermined hash function, for a bit stream composed of the plurality of structural data sorted by the data standardization device, and a data transformation that sorts the plurality of structural data sorted by the device data standardization device, on the basis of a second rule that is different from the first rule, with a key being the message digest calculated by said message digest generation device; and

    an information alteration detection apparatus which detects any alteration of the plurality of structural data with the information that is embedded by the embedded information apparatus including a data standardization device that sorts a plurality of structural data on the basis of the first rule, a message digest generation device that calculates a message digest with the hash function, for a bit stream composed of the plurality of structural data that is sorted by said data standardization device a data transformation device that sorts the plurality of structural data sorted by said data standardization device on the basis of the second rule, with a key being the message digest calculated by said message digest generation device and a decision device that compares the plurality of structural data, which is sorted by said data transformation device, with the plurality of structural data before being sorted by said data standardization device, and that decides the plurality of structural data, before being sorted by said data standardization device, have not been altered when both of the structural data match, and decides the plurality of structural data, before being sorted by said data standardization means, have been altered when both of the structural data do not match.

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