Secret signaling system with means for preventing key disclosure

Details Secret signaling system with means for preventing key disclosure Secret signaling system with means for preventing key disclosure

1945-05-10

1976-03-16

Tobbesing, T. H.

325 32, H04K 102

Patent

active

039447456

ABSTRACT:
1. In a signaling system for transmitting with secrecy signals of varying amplitude, means to encipher said signals comprising means to produce variable key currents and means to combine said signals with said key currents to produce for transmission combination signal and key currents, and means to modify the variable key current that is sent whenever the signal has zero value.

REFERENCES:
patent: 1598673 (1926-09-01), Blackwell
patent: 2262838 (1941-11-01), Deloraine et al.
patent: 2272070 (1942-02-01), Reeves
patent: 2406977 (1946-09-01), Wendt
patent: 2423546 (1947-07-01), Bedford
patent: 2449467 (1948-09-01), Goodall

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