Decryption device

Details Decryption device Decryption device

1989-11-30

1991-10-08

Tarcza, Thomas H.

Cryptography

By modifying optical image

380 56, G09C 500

Patent

active

050561421

ABSTRACT:
A decryption device, comprising a substrate, a plurality of encrypted information symbols located within a rectangular array of further symbols carried by the substrate, wherein the array is arranged in a predetermined number of rows by a further predetermined number of columns. A pair of registration marks are carried by the substrate and located on opposite sides of a predetermined one of the rows. An overlay is adapted for covering the rectangular array, and includes a first pair of apertures arranged to uncover the pair of registration marks, and a plurality of further apertures arranged to uncover the plurality of encrypted information symbols responsive to the first pair of apertures uncovering the pair of registration marks.

REFERENCES:
patent: 1189277 (1916-07-01), Martens
patent: 1222010 (1917-04-01), Mack
patent: 1311457 (1919-07-01), Nicoletti
patent: 1813257 (1931-07-01), Rand, Jr.
patent: 2407067 (1946-09-01), Erminger
patent: 2879608 (1959-03-01), Watkins
patent: 3089260 (1963-05-01), Gray
patent: 3289320 (1966-12-01), Mair
patent: 4074445 (1978-02-01), Friedman
patent: 4512581 (1985-04-01), Levine

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