Non-counterfeitable document system

Details Non-counterfeitable document system Non-counterfeitable document system

1984-06-22

1985-10-08

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

235487, H04Q 900, G06K 500, G06K 708

Patent

active

045463522

ABSTRACT:
A system is disclosed for authenticating an object on the basis of certain physical phenomena or character, specifically, measurable, but not practicably duplicable random variations in the object. In one form, the object (authenticator (T)) is a paper tag having a reference space (14), the varying translucency pattern of which is measurable but practicably unduplicable characteristic of the paper. The reference space (14) is sensed to provide reference signals indicative of the varying translucency. A reference numeral (10) is then provided from some registered form, as on the tag or in a list. If the numeral (10) is readily accessible, it likely will be crytographically encoded. Note the value of putting encoded information on the tag to avoid the need for large reference files.

REFERENCES:
patent: 3875375 (1975-04-01), Scuitto et al.
patent: 4025759 (1977-08-01), Scheffel
patent: 4034211 (1977-07-01), Horst et al.
patent: 4450348 (1984-05-01), Stockburger et al.

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