Method for preventing illegitimate use of chip cards
First Claim
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1. A method for detecting an attempt at manipulatory intervention in a smart card, which comprises the steps of:
- using various sensors for detecting abnormal operating states;
sensing an occurrence of an abnormal operating state by some of the sensors; and
after the abnormal operating state has been sensed but before triggering a countermeasure, at least one of;
successively switching the sensors into a higher sensitization state, orsuccessively activating more sensitive sensors.
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Abstract
In order to detect attempted interventions in the vicinity of a smart card, a sensor hierarchy is used. Abnormal operating states are first detected by less sensitive sensors that are connected upstream and which then activate sensors which are connected downstream and have a relatively high degree of sensitivity, or increase the sensitivity of sensors connected downstream.
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3 Claims
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1. A method for detecting an attempt at manipulatory intervention in a smart card, which comprises the steps of:
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using various sensors for detecting abnormal operating states; sensing an occurrence of an abnormal operating state by some of the sensors; and after the abnormal operating state has been sensed but before triggering a countermeasure, at least one of; successively switching the sensors into a higher sensitization state, or successively activating more sensitive sensors. - View Dependent Claims (2, 3)
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Specification