A secure data entry device including a housing having at least one housing element, at least one additional element located within the housing, at least one force sensitive switch, employing at least one force sensitive film, disposed within the housing in force sensing engagement with at least one of the at least one housing element and the at least one additional element and arranged to sense tamper induced displacement thereof relative to at least another one of the at least one housing element and the at least one additional element and to provide an electrical output indicating tampering and a tampering responsive circuit, responsive to the electrical output indicating tampering.