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. 12, 2009
Filed:
Jul. 07, 2003
Hideyoshi Yoshimura, Nara, JP;
Hideyoshi Yoshimura, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An anti-tampering signature apparatus is provided with an extraction portionfor extracting a characteristic quantity that represents a characteristic of image data according to an instruction from a certifier who has certified display data, an encryption/decryption portionthat generates encrypted data by encrypting the characteristic quantity using an encryption key paired with an identifier and decrypts the encrypted data into the characteristic quantity, a media writing portionthat appends the identifier and the encrypted data to a rewritable medium, and a controllerthat judges whether or not the decrypted characteristic quantity and the characteristic quantity extracted from image data generated by reading the display data match.