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Line-based chip card tamper detection

  • US 10,621,590 B2
  • Filed: 02/22/2017
  • Issued: 04/14/2020
  • Est. Priority Date: 02/22/2017
  • Status: Active Grant
First Claim
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1. A transaction device for exchanging information and having circuitry for detecting an attempt to tamper with a contact interface of the transaction device, comprising:

  • a contact interface comprising a plurality of pins;

    a processing unit coupled to the contact interface and configured to execute instructions;

    a plurality of contact lines coupled between the plurality of pins of the contact interface and the processing unit;

    a memory having the instructions stored thereon and coupled to provide the instructions to the processing unit, wherein the instructions cause the processing unit to;

    apply a non-standard signal to one or more of the plurality of contact lines;

    measure a response value for the non-standard signal; and

    identify the attempt to tamper with the contact interface based on the response value.

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