Device for detecting attempts at fraud on an apparatus for readi

Details Device for detecting attempts at fraud on an apparatus for readi Device for detecting attempts at fraud on an apparatus for readi

1994-10-27

1996-04-23

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324655, 324682, 324683, 235441, 235492, 340653, G01R 2726

Patent

active

055107206

ABSTRACT:
A device for detecting attempts at fraud by connection of an electric feed line (13) to an apparatus for reading and writing on a chip card (3) essentially comprises a resonance unit (6) coupled to a contacting element (2) of the apparatus, and a measuring device (7). In the resonance unit (6) a generator (4) which is coupled to a resonator (1) by way of an impedance converter (5) generates a standing wave. The feed line (13) disturbs the properties of the resonator (1), that being detected by the measuring device (7) and evaluated.

REFERENCES:
patent: 4785166 (1988-11-01), Kushima
patent: 4792667 (1988-12-01), Chen
patent: 4999601 (1991-03-01), Gervais
patent: 5122646 (1992-06-01), Taeymans et al.
patent: 5198777 (1993-03-01), Masuda et al.
patent: 5270526 (1993-12-01), Yoshihara
patent: 5434397 (1995-07-01), Diehl et al.

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