Start/stop teleprinter scrambler

Details Start/stop teleprinter scrambler Start/stop teleprinter scrambler

1961-05-19

1979-09-18

Birmiel, Howard A.

Telegraphy

Systems

Printing

328 37, H04L 902

Patent

active

041683951

ABSTRACT:
1. A start/stop cryptographic telegraphy terminal-equipment comprising electronic means for generating clock pulses, means responsive to the clock pulses for generating timing pulses occurring at a substantially predetermined rate less than the occurrence rate at which said clock pulses are generated, means responsive to the generated timing pulses for generating a cryptographic-key signal and means for initiating the generating of the clock pulses in response to a telegraph start signal supplied to the equipment, said last named means including means for combining the telegraph and cryptographic-key signals. 31. In combination, a pair of parallel binary signal sources, a counting chain having a plurality of stages, means for advancing the count of said chain when a first predetermined status of the convinced Boolean values of said signals is achieved, and means for resetting the count in said chain to the first stage when a different predetermined status of the combined Boolean values of said signals is achieved.

REFERENCES:
patent: 3185765 (1965-05-01), Berjon
patent: 3965296 (1976-06-01), Miller
patent: 3991268 (1976-11-01), Goodall

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