Digital cryptographic system and testing thereof

Details Digital cryptographic system and testing thereof Digital cryptographic system and testing thereof

1978-05-26

1979-10-09

Birmiel, Howard A.

Telegraphy

Systems

Printing

3401461E, H04L 900

Patent

active

041707141

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: 2898402 (1959-08-01), Cory et al.
patent: 3633178 (1972-01-01), Zopf
patent: 3878331 (1975-04-01), Morgan et al.
patent: 3889109 (1975-10-01), Blessin
patent: 3911216 (1975-10-01), Bartek et al.
patent: 3920975 (1975-11-01), Bass
patent: 3943348 (1976-03-01), Akriche et al.
patent: 4034195 (1977-07-01), Bates et al.
patent: 4079188 (1978-03-01), Kinch, Jr. et al.

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