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Method and apparatus for verifying the integrity of a smart card

  • US 5,416,423 A
  • Filed: 03/28/1994
  • Issued: 05/16/1995
  • Est. Priority Date: 04/07/1993
  • Status: Expired due to Fees
First Claim
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1. A method of verifying the integrity of a card under test having exterior contact terminals and on-board electronic circuitry containing coded data to be read in a host reader, comprising the steps of:

  • detecting capacitance of wires connecting the card under test to the host reader, applying a signal to the card under test, and comparing-a current result of the signal on a detector with a previous result obtained from a genuine and authorized card to establish whether the card under test is genuine.

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