Patent ID: 8585094
Filing Date: 2013-11-19
Classification: G07D,H04L

Abstract:
1. A method for deterring security instrument copying, comprising: receiving a plurality of security instruments media, wherein each security instrument medium is associated with a unique watermark serial number incorporated within the security instrument medium as a watermark, wherein each unique watermark serial number uniquely identifies the security instrument medium within which the unique watermark serial number is incorporated; marking onto each security instrument medium a unique matter serial number, wherein each unique matter serial number uniquely identifies a security instrument created from the security instrument medium onto which the unique matter serial number is marked; for a given security instrument, combining the unique watermark serial number incorporated within the security instrument medium of the given security instrument and the unique matter serial number marked onto the security instrument medium of the given security instrument to create a unique combined serial number; creating a digital signature by encoding the unique combined serial number using a private key of a public/private key pair; and imprinting the digital signature on the security instrument medium of the given security instrument.