Secure communication control system
US4985919A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1989 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Sep 27, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4486
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Encoder/decoders are associated with conventional local and far-end communications equipment such as facsimile machines. Information to be faxed is encoded at one end, transmitted to the other end, and decoded, without affecting normal communications protocol or requiring other specialized equipment at either end. A secure information processing device is provided at each end, between the equipment and the communications line, and either encodes outgoing information or decodes incoming information, in accordance with a randomly generated key code, depending on whether the equipment at a particular end is transmitting or receiving a communication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.