Secure communication keying system
US5493612A · kind A · utility
4Cited by
7References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1962 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Mar 27, 1982 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The secure communication keying system has a noise generator whose output a predetermined finite band of noise within, for example, the zero to eleven hundred cycle per second range. The noise generator may be a pseudorandom noise generator that is synchronized with a given clock frequency. The output of the system may have noise-like characteristics, but it is encoded with any type of intelligence desired to be transmitted. The output signals simulate the ambient noise occurring within the communication medium and has the same frequency spectrum regardless of the frequency of the modulating signals supplied thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.