Abstract: An apparatus for use in kiosks or other computerized devices for filtering out selected key codes transmitted between an input device, such as a keyboard, and a host computer. The apparatus includes an input port to receive key codes transmitted from a keyboard en route to a host computer or workstation. A key code filter may be used to filter out or block selected key codes, sequences of key codes, and combinations of key codes, and to prevent unauthorized persons from accessing certain functions of the host computer. Key codes blocked or filtered out may be modified in accordance with each particular system. Once selected key codes are filtered out, an output port passes the remaining unblocked key codes to a host computer.