The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2003
Filed:
Nov. 23, 1998
Seppo Reino Keronen, Eastwood, AU;
Stamatios Demetriou, Beecroft, AU;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A certifier device ( ) for producing a certified document ( ) of an original document ( ) and a verifier device ( ) for verifying the certified document ( ). The certifier device ( ) includes a scanner ( ) for scanning the original document ( ) to generate a true copy image. The certifier has also an encoder ( ) for computing a digital code which is representative of the true copy image; an encryptor ( ) for encrypting the digital code according to a private key associated with a certifier identification; and a compositor ( ) for compositing an image including the true copy image together with the encrypted digital code and certifier identification. The verifier device ( ) includes a scanner ( ) for scanning the certified document ( ); a decryptor ( ) for decrypting the encrypted digital code according to a public key associated with the certifier identification; and a encoder ( ) for computing a digital code which is representative of the true copy image. The verifier ( ) also has a comparator ( ) for comparing the digital code supplied by said encoder ( ) and said decrypted digital code supplied by said decryptor ( ); wherein a match of the digital codes indicates the certified document is authentic and a mismatch indicates the document is not authentic.