Method of manufacturing and authenticating a card printed with digital information by digital watermarking technique and its apparatus therefor

摘要

For producing the card printed with digital information, a digital image to be printed on the card is manufactured by using information provided by an applicant who requests the issuance of a card, or information on issuance extracted from a database with the information on authentication. At the same time, a watermark is generated by using the information on authentication, the watermark is embedded into the digital image and then, the water-embedded digital image is printed on the card. Thereafter, a watermark-embedded region is captured from the digital image generated by scaning the printed image, and a watermark is extracted from the digital image within the watermarking-embbeded region, Meanwhile, a watermark is generated by inputting information on authentication obtained from a cardholder. Then, the authentication is determined from the co-relation between the extracted watermark and the generated watermark.