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Method for preventing illegitimate use of chip cards

  • US 20040112965A1
  • Filed: 12/18/2001
  • Published: 06/17/2004
  • Est. Priority Date: 05/21/1999
  • Status: Active Grant
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

    activating the sensors with a relatively high degree of sensitivity relative to an overall sensitivity of the sensors as a group after the abnormal operating state has been sensed.

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