Telegraphy – Systems – Printing
Patent
1976-11-10
1979-01-09
Birmiel, Howard A.
Telegraphy
Systems
Printing
H04L 902
Patent
active
041339738
ABSTRACT:
The specification discloses a digital cryptographic system wherein each of the transmitting and receiving units includes a housing having a front panel. A push-button switch input array is mounted on the front panel, with each push-button switch corresponding to a different number to enable the manual inputting of code variables therethrough. A digital display is provided on the front panel to temporarily display each of the code variables input through the array. Storage circuits are provided to store the code variables input through the array. A switch is provided on the front panel to enable any one of the stored code variables to be selected. A random code generator is operable in response to the selected stored code variables in order to generate a sequence of randomized key digital bits. Circuitry is provided to encipher clear text digital data in a synchronous manner and to transmit enciphered data through a synchronous data link.
REFERENCES:
patent: 3728529 (1973-04-01), Kartchner et al.
patent: 3740475 (1973-06-01), Ehrat
patent: 3808365 (1974-04-01), Ehrat
patent: 3876832 (1975-04-01), Morgan et al.
patent: 3911216 (1975-10-01), Bartek et al.
patent: 4068089 (1978-01-01), Kuhnlein et al.
Branscome Kenneth M.
Carter Merlon B.
Morgan Barrie O.
Birmiel Howard A.
Datotek, Inc.
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