Device for detecting attempts at fraud on an apparatus for reading and writing on a chip card
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United States of America Patent
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May 2, 1995
Issued Date -
N/A
app pub date -
Jan 27, 1993
filing date -
Mar 17, 1992
priority date (Note) -
Expired
status (Latency Note)
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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.
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