CONTENTS PROCESSING DEVICE AND CONTENTS PARTIAL INTEGRITY ASSURANCE METHOD

  • US 20110078458A1
  • Filed: 09/20/2010
  • Published: 03/31/2011
  • Est. Priority Date: 09/25/2009
  • Status: Abandoned Application
First Claim
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1. A contents processing device, comprising:

  • a management data storage unit configured to store an updater identifier and a private key in a correlated manner;

    an accepting unit configured to accept a content which is divided into a plurality of blocks, an updating type indicating a type of updating as to the content, an updated block of the content, and an updated position;

    an inserting unit configured to generate an updated content by inserting an updating block into the updated position of the content in an event that the updating type is an insertion;

    a first hash value calculating unit configured to calculate a hash value as to the updated block;

    a signature unit configured to read out the updater identifier and the private key from the management data storage unit to generate a digital signature using the private key as to updating record information including the updater identifier, the updated position, the hash value as to the updated block, and the updating type; and

    an output unit configured to output the updated content, the updating record information, and the digital signature.

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