Secure document workflow

  • US 8,477,379 B2
  • Filed: 12/02/2009
  • Issued: 07/02/2013
  • Est. Priority Date: 10/06/2009
  • Status: Active Grant
First Claim
Patent Images

1. A method, for a first participant in a secure document workflow, of generating workflow information for authenticating a document, the method comprising:

  • receiving an image of the document;

    generating workflow information for the document image, includinga document image descriptor dependent upon the appearance of the document image for later verifying the integrity of a version of the document image that has been printed and scanned, the verification comprising electronically combining or comparing the document image descriptor with said version of the document image;

    generating a digital signature for later verifying the authenticity of the workflow information, the digital signature being derived from the workflow information using a cryptographic key associated with the first participant;

    adding the digital signature to the workflow information; and

    communicating the document image and the workflow information to another workflow participant.

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