Method for the detection of authenticity in a data carrier and a

Registers – Coded record sensors – Particular sensor structure

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235493, 235380, 235454, 382 50, 250205, 34082534, H01Q 900

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active

046509798

ABSTRACT:
The present invention specifies a method for the verification of authenticity in a data carrier (1) by measuring permeability to an electromagnetic radiation in at least one region of the data carrier (1). Permeability is scanned over a regional area of the data carrier by means of a radiation detector (7) first in a calibration operation, in which the radiation intensity is adjusted, then in a reading operation at another position of the data carrier. The output signal of the detector (7) is coded and co-inscribed as additional information in a store of the data carrier with the information data during the initial inscribing of these data. In the reading and authenticity check scanning operation this information is compared with a corresponding additional information stored during the original data inscription.

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IBM Tech. Disclosure Bulletin, vol. 15, No. 1, 6/72, p. 276.

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