Data scrambling apparatus

Details Data scrambling apparatus Data scrambling apparatus

1986-09-22

1988-04-05

Cangialosi, Salvatore

Cryptography

Electric signal modification

Having production of printed copy

380 48, H04L 900

Patent

active

047364246

ABSTRACT:
A data scrambler-descrambler combination is illustrated which stores previously modified received data and alters data passing through on the basis of certain of the previously stored data bits. Additionally, the previously stored data is monitored to detect repetitive patterns, which indicate that the scrambler is no longer properly scrambling the signal, and introducing a pattern breaking data bit into the storage means whenever such a pattern is detected.

REFERENCES:
patent: 3925612 (1975-12-01), Guanella et al.
patent: 4109856 (1978-08-01), van Beveren et al.
patent: 4304962 (1981-12-01), Fracassi et al.
patent: 4434322 (1984-02-01), Ferrell
patent: 4447672 (1984-05-01), Nakamura

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