Secure point of sale terminal

摘要

A data entry device including a housing formed of at least two portions, data entry circuitry located within the housing, at least one case-open switch assembly operative to sense when the housing is opened and tamper indication circuitry operative to receive an input from the at least one case-open switch assembly and to provide an output indication of possible tampering with the data entry circuitry located within the housing, the at least one case-open switch assembly including an arrangement of electrical contacts including at least first, second and third contacts and a displaceable conductive element, the tamper indication circuitry and the third contact together being operative such that when the third contact is short circuited to at least one of the first contact, the second contact and another contact, an output indication of possible tampering is provided.

主权项

1. A device comprising:
an enclosure; circuitry located on an electrical circuit board within said enclosure; at least one switch assembly operative to sense when said enclosure is opened; and tamper indication circuitry operative to receive an input from said at least one switch assembly and to provide an output indication of possible tampering with said circuitry located on said electrical circuit board within said enclosure, said at least one switch assembly including a raised resilient dome and an arrangement of electrical contacts located on said electrical circuit board, said electrical contacts including at least first, second and third mutually concentric conductive pads all underlying said dome; said at least first, second and third mutually concentric conductive pads and said raised resilient dome being configured and arranged such that as long as said enclosure is closed in a non-tampered state, said raised resilient dome is in electrical contact with some but not all of said at least first, second and third mutually concentric conductive pads, said tamper indication circuitry being operative such that when electrical connections between said at least first, second and third mutually concentric conductive pads change from those in said non-tampered state, an output indication of possible tampering is provided.