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DIGITAL SIGNATURE SERVER AND USER TERMINAL

  • US 20130132728A1
  • Filed: 11/25/2009
  • Published: 05/23/2013
  • Est. Priority Date: 11/25/2009
  • Status: Active Grant
First Claim
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1. A signature data server operative to generate signature data indicating that content data is a certified one, comprising:

  • a signature key column set database configured to store a signature key column set which is an aggregate of signature key columns each of which is an aggregate of a plurality of signature keys;

    a correspondence relationship information database configured to store correspondence relationship information indicating a correspondence relationship between a signature key set and a user terminal, the signature key set being an aggregate of any signature keys selected from the signature key columns respectively; and

    a signature data generating unit configured to generate signature data by encrypting a content digest by using the plurality of signature keys included in the signature key column set, the content digest being generated based on the content data.

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