Cryptography – Cryptanalysis
Patent
1992-01-22
1993-06-01
Swann, Tod R.
Cryptography
Cryptanalysis
380 6, 380 48, 380 10, 455 1, H04N 102
Patent
active
052167135
ABSTRACT:
In a extraneous of signal method of preventing 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.
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Smiley, Charles; "Exchange data between digital systems"; Electronic Design, vol. 25 No. 9; Apr. 26, 1977 pp. 96-98.
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Shield Research in Sweden
Swann Tod R.
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