Patent ID: 7815109

Claim:
A system comprising a sensing device and a processor for 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 sensing device is configured to: sense one of the coded data portions; and generate, using the sensed coded data portion, indicating data indicative of: the identity; the part of the signature; and a signature part identifier; and the processor is configured to: determine, a determined signature using the identity; determine a determined signature part using the determined signature and the signature part identifier; and determine if the security document is a counterfeit document by comparing the determined signature part and the part of the signature.