| US 7,461,778 B2 | ||
| Method of identifying a copied security document | ||
| Kia Silverbrook, Balmain (Australia); and Paul Lapstun, Balmain (Australia) | ||
| Assigned to Silverbrook Research Pty Ltd, Balmain, New South Wales (Australia) | ||
| Filed on Sep. 28, 2007, as Appl. No. 11/863,255. | ||
| Application 11/863255 is a continuation of application No. 11/041651, filed on Jan. 25, 2005. | ||
| Claims priority of application No. 2004902623 (AU), filed on May 18, 2004. | ||
| Prior Publication US 2008/0050004 A1, Feb. 28, 2008 | ||
| Int. Cl. G06Q 40/00 (2006.01); G07D 11/00 (2006.01); G07F 19/00 (2006.01) | ||
| U.S. Cl. 235—379 [235/380] | 7 Claims |
| 1. A method of determining a counterfeit security document, the security document having disposed thereon or therein coded
data including a number of coded data portions, each coded data portion being indicative of:
an identity of the security document; and
a part of a signature, the signature being a digital signature of at least a part of the identity and comprising a plurality
of signature parts;
wherein the method includes the steps of:
in a sensing device:
sensing one of the coded data portions; and
generating, using the sensed coded data portion, indicating data indicative of:
the identity;
the part of the signature; and
a signature part identifier;
in a processor:
determining, a determined signature using the identity;
determining a determined signature part using the determined signature and the signature part identifier; and,
determining if the security document is a counterfeit document by comparing the determined signature part and the part of
the signature.
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