Information processing apparatus and its control method, computer program, and storage medium
US7146502B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 2002 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Jul 13, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3281
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Whether or not information has been tampered with can be detected while authentication information is set to be inseparable from digital information, and original digital data can be restored as long as it is free from tampering. For this purpose, when authentication information is embedded into digital information input by an image input unit (201), a Hash value calculation unit (202) generates authentication information based on that digital information, an encryption unit (203) encrypts the authentication information using an encryption key, and a digital watermarking unit (204) embeds the encrypted information in the digital information as a digital watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.