Copying machine with encryption function
US5512977A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1995 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Apr 21, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4486
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Information is read from a medium such as paper in which information is written. The read information is enciphered. When encryption processing is performed, an encryption key is used. As the encryption key, an encryption key generated for each encryption is used, or an encryption key already generated is used again. The enciphered information is written into another medium such as paper. When decryption processing is performed, information is read from the medium in which the enciphered information is written. The read information is deciphered using as a decryption key the same key as the encryption key used when the encryption processing is performed. The deciphered information is written into another medium such as paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.