| US 7,506,168 B2 | ||
| Method for identifying a counterfeit security document | ||
| Kia Silverbrook, Balmain (Australia); and Paul Lapstun, Balmain (Australia) | ||
| Assigned to Silverbrook Research Pty Ltd, Balmain, New South Wales (Australia) | ||
| Filed on Jan. 25, 2005, as Appl. No. 11/41,652. | ||
| Claims priority of application No. 2004902623 (AU), filed on May 18, 2004. | ||
| Prior Publication US 2009/0037739 A1, Feb. 05, 2009 | ||
| Int. Cl. G06F 21/00 (2006.01) | ||
| U.S. Cl. 713—176 | 16 Claims |
| 1. A method of determining a counterfeit security document, the security document having disposed thereon or therein coded
data including a plurality of coded data portions, each coded data portion being indicative of:
an identity of the security document; and,
a signature part, the signature part being a part of a digital signature of at least part of the identity; wherein the method includes steps of:
in a sensing device:
sensing a plurality of coded data portions; and,
generating, using the sensed coded data portions, indicating data indicative of:
the identity;
the respective signature parts; and
an identifier for each signature part:
in a processor:
determining, from the indicating data:
a determined identity; and,
a determined signature from the plurality of signature parts by arranging signature parts according to respective identifiers;
determining a generated identity from the sensed signature; and
determining if the security document is a counterfeit document by comparing the determined identity and the generated identity.
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