METHODS OF ISSUING/VERIFYING CERTIFICATE, SYSTEMS OF ISSUING/VERIFYING CERTIFICATE, PROGRAM FOR THE METHODS, AND RECORDING MEDIUM IN WHICH PROGRAM IS STORED

摘要

PPROBLEM TO BE SOLVED: To enable verification of whether a certificate is issued authentically, simultaneous verification of whether the certificate is a copy or an original, and identification of tampered locations. PSOLUTION: A center 104 for issuing the certificate identifies an individual who applies for the issuance of the certificate, and transmits the certificate which is embedded with a first electronic watermark to the applier side via a network 105. A personal computer 101 of the certificate applicant prints the certificate which is embedded with a second electronic watermark. A device for verifying the certificate determines, for example, that the certificate is the original authentically issued, or that the certificate is not the original, even though it has been authentically issued, based on whether the first and second watermarks can be read. PCOPYRIGHT: (C)2004,JPO&NCIPI