Patent ID: 6611598
Filing Date: 2003-08-26
Classification: B42D,G06Q,G07D,G07F

Abstract:
In an imprinted valuable document having encoded symbols readable by a document reader, a method for enabling subsequent authenticating and verifying non-alteration of said document via a document reader, comprising the steps of:(a) imprinting a two-dimensional bar code on said document which includes an assemblage data group of information which, when read by a document reader, will automatically authenticate the source of the document and verify its original data as standing without alteration; said assemblage data group including: the type and version number of each said documents; a personal identification field of the originator of each of said documents; a digital certificate which contains a tamper-proof public key belonging to the document issuer to allow the public key to be used for verification; and the data of said document; b) utilizing a hash function for creating a message digest which is then signed utilizing a private key from a 2-key digital signature system; and, c) incorporating a digital signature which can be verified by using a public key and known hashing algorithm when the said document is passed through a document reader.