Method of securing data on a data support

Details Method of securing data on a data support Method of securing data on a data support

1984-06-18

1987-11-10

Yusko, Donald J.

Registers

Coded record sensors

235469, 34082534, G06K 712

Patent

active

047059389

ABSTRACT:
A method of securing data recorded on a data support and a device for performing the method are disclosed. In addition to the basic information contained in the data recorded on the data support, for generating an additional security code, selected individual properties of the recorded data are used which differ from each other as regards their physical and/or chemical properties. In one embodiment, individual characters imprinted on the data support are used which differ from each other with respect to contrast or half-tone density in a manner unperceivable to human sight, but easily detectable by a detector or an automatic reading apparatus. Authenticity of the data support or data is determined by a security code contained in the specific physical or chemical properties of the selected individual characters. The method prevents from duplication or falsifying of data supports.

REFERENCES:
patent: 4034211 (1977-07-01), Horst et al.
patent: 4094462 (1978-06-01), Moschner
patent: 4469937 (1984-09-01), Stockburger et al.

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