Cryptography – Electric signal modification – Having production of printed copy
Patent
1992-11-13
1994-04-12
Cain, David C.
Cryptography
Electric signal modification
Having production of printed copy
380 23, H04L 900
Patent
active
053033701
ABSTRACT:
An image of a symbol or other indicium of origin or authenticity is encrypted, and printed on the item or a label in superposition with a color mask. In a preferred embodiment, an intermediate parallax record is formed of a series of images of a symbol or other indicium, each differing from the preceding one by a predetermined amount of parallax (i.e. change of viewing angle.) A multiple exposure of the series of intermediate parallax record images is made through a lenticular screen to create the encrypted image of the indicium. The lenticular screen and the medium on which the multiple exposure is made are moved relative to each other between exposures. The encrypted image and the superimposed color mask are then printed as a composite image to produce an unintelligible criss-cross of colored lines. When viewed through a lenticular screen which matches that used to create the encrypted image, the original indicium is revealed in clear form.
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Brosh Scott
Wright Timothy
Cain David C.
Hoffman Lawrence A.
Score Group, Inc.
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