Method and apparatus for preventing extraneous detection of sign

Details Method and apparatus for preventing extraneous detection of sign Method and apparatus for preventing extraneous detection of sign

1993-04-22

1994-06-14

Swann, Tod R.

Cryptography

Cryptanalysis

380 6, 380 48, 380 10, H04N 102

Patent

active

053217470

ABSTRACT:
In a method of preventing extraneous detection of signal information from raster scan signals in a plurality of consecutive line signals intended to form an image or partial images there is generated a random signal sequence, correlated with the information-carrying raster scan signals, but without information content, which is transmitted as protection for the raster scan signals. An apparatus for this purpose includes a generator (10, 12) adapted for generating a random signal sequence synchronous with the raster scan signals, and a switching element (5) adapted to transmit the random signal sequence round the equipment containing the raster scan signals that are to be protected.

REFERENCES:
patent: 4217550 (1980-08-01), Blassel et al.
patent: 4342119 (1982-07-01), Seidl
patent: 4563546 (1986-01-01), Glitz
patent: 5157725 (1992-10-01), Lindholm
patent: 5165098 (1992-11-01), Hoivik
patent: 5216713 (1993-06-01), Lindholm

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