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Method and system for encoding signatures to authenticate files

  • US 7,711,958 B2
  • Filed: 06/29/2007
  • Issued: 05/04/2010
  • Est. Priority Date: 09/12/2002
  • Status: Active Grant
First Claim
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1. A method for encoding authentication information in the filenames of computer files containing digital data, said method comprising:

  • computing a hash value H0 by applying a master hash function to only the digital data comprised by a master computer file, said master computer file having an original filename;

    computing a digital signature of the hash value H0 using a private key of a sender such that the digital signature of H0 has a predetermined fixed length;

    generating a signed filename of the master computer file by encoding the computed digital signature of the hash value H0 in the original filename of the master computer file;

    associating the signed filename of the master computer file with the master computer file;

    computing a hash value H1 by applying a first hash function to only the digital data comprised by a first computer file, said first computer file having an original filename;

    computing a digital signature of the hash value H1 using the private key of the sender;

    generating a signed filename of the first computer file by encoding the computed digital signature of the hash value H1 in the original filename of the first computer file;

    associating the signed filename of the first computer file with the first computer file; and

    generating a composite computer file by attaching to the master computer file the first computer file and its associated signed filename; and

    sending the composite computer file from the sender to a receiver.

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