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Digital data authentication method

  • US 6,131,162 A
  • Filed: 06/04/1998
  • Issued: 10/10/2000
  • Est. Priority Date: 06/05/1997
  • Status: Expired due to Fees
First Claim
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1. An embed-in-content information processing method for embedding information on k (k is an integer equal to or larger than 2) content-handling persons using an electronic computer, the method comprising the steps of:

  • creating a digital signature of a first content-handling person by encrypting a hash value using a private key in accordance with a public key cipher system of the first content-handling person, the hash value being created by evaluating the content with a first hash function;

    sequentially repeating digital signature creation for a second person to a k-th content-handling person to create the digital signatures of the content-handling persons; and

    embedding the digital signature of the k-th content-handling person into the content such that the digital signature of the k-th content-handling person cannot be separated from the content without using a predetermined rule, the digital signature of the k-th content-handling person being obtained by performing said digital signature creation for the k-th content-handling person, wherein, during said digital signature creation processing for an i-th content-handling person (i is an integer between 2 and k), a value dependent on the digital signature of the (i-1)th content-handling person is encrypted using the private key of the i-th content-handling person to generate the digital signature of the (i-)th content-handling person.

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