Rugged keypad

摘要

A tamper-resistant or tamper-evident keypad device for use in secure transactions. The keypad comprises multiple security mechanisms to prevent tampering to the device, and thus access to users' private information. The keypad is made of resilient materials and contains a tamper-resistant collar for housing the keypad's connector interface. The keypad comprises a multi-layered printed circuit board with at least two internal security-shield layers comprising switch trace protection, as well as additional security layers for tamper protection. The keypad comprises a silicon-rubber keypad actuator that engages tamper switches on the flexible security circuit. The keypad comprises an optional dome layer.

主权项

1. A keypad for connecting to a machine having a connector interface, comprising
a housing having a front panel with an outer face and inner surface, the front panel having a plurality of openings and a plurality of sides projecting from the front panel defining an area; a plurality of keycaps protruding through the openings on the front panel from the inner surface to the outer face; a multi-layer printed circuit board having a front face having a plurality of conductive pathways, wherein the movement of one of the keycaps connects with one of the plurality of conductive pathways, the multi-layer printed circuit board having a back face with a plurality of terminals associated with at least some of the conductive pathways; two or more security-shield layers within the multi-layered printed circuit board comprising switch trace protection interposed between the front and back faces, comprising a pair of conductive pathways positioned around the periphery of each layer creating a closed loop for determining if the multi-layered printed circuit board has been edge tampered with; a flexible security circuit interposed between the inner surface of the front panel of the housing and the multi-layer printed circuit board, the flexible security circuit having a plurality of conductive pathways spaced apart by about 0.25 mm to about 0.8 mm for determining if the flexible security circuit has been tampered with; a plurality of connectors extending from terminals on the back face of the circuit board to the connector interface of the machine; and a collar for encircling the connectors that extends from the back face of the multi-layer printed circuit board to the machine to limit unauthorized access to the plurality of connectors.