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Encrypting pin pad

  • US 9,430,675 B2
  • Filed: 05/21/2013
  • Issued: 08/30/2016
  • Est. Priority Date: 05/21/2013
  • Status: Active Grant
First Claim
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1. An Encrypting PIN Pad (EPP) comprising:

  • a keyboard body for supporting a plurality of keys including at least one actuator member extending inwardly from the keyboard body;

    a first layer comprising at least two electrode elements separated by a space;

    a second layer between the first layer and the keyboard body comprising at least one bridge element;

    wherein the actuator member applies pressure to the bridge element in a normal state, causing the bridge element to electrically bridge the space between the at least two electrode elements, wherein the bridge element fails to electrically bridge the space during a tamper state resulting from unauthorized separation of the keyboard body from the first layer; and

    a controller for detecting the tamper state by monitoring resistance of the bridge element wherein a failure of the bridge element to electrically bridge the at least two electrode elements is identified when the resistance increases above a threshold resistance.

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