Cryptographic encoder-decoder

Details Cryptographic encoder-decoder Cryptographic encoder-decoder

1981-06-05

1983-10-04

Cangialosi, Sal

Telegraphy

Systems

Printing

178 2209, H04K 100

Patent

active

044080930

ABSTRACT:
An electronic cryptographic encoder-decoder is disclosed which performs the equivalent operations of a known simple hand-held cryptographic encoder-decoder. The electronic cryptographic encoder-decoder includes a parallel addressable, programmable read only memory receiving parallel data input from a serial to parallel converter and providing parallel data output which is converted to a serial data output by a parallel to serial converter. The memory element has stored therein a plurality of different predetermined encryption-decryption character code groups addressed by the parallel input data and controlled by a character counting arrangement including a multiplicity of multi-contact switches to establish a unique code and to select appropriate ones of the plurality of code groups as determined by the unique code to provide the parallel output data from the memory means.

REFERENCES:
patent: 1657366 (1928-01-01), Belin
patent: 3639690 (1969-09-01), Braun et al.
patent: 4058673 (1977-11-01), Johansson
patent: 4120030 (1978-10-01), Johnstone
patent: 4168396 (1979-09-01), Best
patent: 4172213 (1979-10-01), Barnes et al.
patent: 4229817 (1980-10-01), Morgan et al.

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