Anti-tampering signature method for rewritable media, anti-tampering signature apparatus for executing the method, anti-tampering signature system provided with the apparatus, and computer-readable recording medium storing anti-tampering signature program for achieving the method
US7533267B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 2003 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Jan 18, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3281
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An anti-tampering signature apparatus is provided with an extraction portion 33 for 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 portion 35 that 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 portion 34 that appends the identifier and the encrypted data to a rewritable medium, and a controller 37 that judges whether or not the decrypted characteristic quantity and the characteristic quantity extracted from image data generated by reading the display data match.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.