Distributed sample scrambling system

Details Distributed sample scrambling system Distributed sample scrambling system

1992-05-22

1993-09-14

Cain, David

Cryptography

Electric signal modification

Having production of printed copy

380 46, 380 48, H04L 900

Patent

active

052456617

ABSTRACT:
A distributed sample scrambling system comprising scrambler and a descrambler. The scrambler includes a first shift register generator (SRG) 2 for generating scrambler SRG sequence, an exclusive OR gate 7 for generating a scrambled bitstream by adding the binary sequence to a scrambler input bitstream, and first sampling unit 2 for sampling the scrambler SRG sequence at non-uniform sampling intervals. The descrambler includes a second shift register generator 5 for generating descrambler SRG sequence, second sampling unit 4 for sampling the descrambler SRG sequence at the same sampling times, a comparator 3 for comparing the samples of descrambler SRG sequence to the samples of scrambler SRG sequence in order to determine whether said samples of both the descrambler and the scrambler are identical, a correction circuitry 6 for outputting correction signals corresponding to the comparison results of the comparator 3 to the second shift register generator 5, and an exclusive OR gate 8 for generating a descrambled bitstream by adding the descrambler SRG sequence to the scrambled bitstream of the scrambler.

REFERENCES:
patent: 3784743 (1974-01-01), Schroeder
patent: 4176247 (1979-11-01), Englund
patent: 4636583 (1987-01-01), Bidell et al.
patent: 4736424 (1988-04-01), Busby
patent: 4771463 (1988-09-01), Beeman
patent: 5023887 (1991-06-01), Takeuchi et al.
patent: 5148485 (1992-09-01), Dent
Report: Parallel Scrambling Techniques for Digital Multiplexlers, AT&T Technical Journal, Author DooWhan Choi, 123-136.
"Modification of PRBS Source Bits in Distributed Sample Scrambler"--CCITT 1989-1992--Melbourne, 2-13, Dec. 1991.
"Self Synchronising Scrambler x.sup.43 +1" CCITT SG XVIII--Melbourne, 2-13, Dec. 1991.

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