Method of identifying a copied security document
AssigneeSilverbrook Research Pty Ltd
InventorsKia Silverbrook, Paul Lapstun
Life of this patent
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Abstract
A method of determining a counterfeit security document which includes a number of coded data portions indicative of an identity of the security document; and at least part of a digital signature of at least part of the identity. The method includes using a sensing device to sense at least one coded data portion and generate indicating data. The indicating data is used by a processor to obtain a determined identity and at least one determined signature part, which are then used to determine if the security document is a counterfeit document.
Claims7
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.
Dependencies are inferred from the claim text.