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 metal discs mounted on the front or rear face of the flexible circuit and an optional dome layer.

A keypad overlay for credit card machines includes a main panel, a lateral wall, a connector wall, a plurality of button receiving features, a first attachment hole, and a second attachment hole. The connector wall and the lateral wall are perimetrically positioned around the main panel. The connector wall is terminally connected to the main panel. The lateral wall is terminally connected to the main panel. The plurality of button receiving features is integrated onto the main panel. The first attachment hole and the second attachment hole are oppositely positioned of each other along the connector wall. The first attachment hole traverses through the connector wall. The second attachment hole traverses through the connector wall.

A data input and/or operator control system, particularly a keypad, also a POS keypad, having a lower portion and an upper portion and also at least one printed circuit board and at least one retaining plate. Inside, one or more protective mat(s) made of an elastic material is/are preferably adhesively bonded to the printed circuit board. In this protective mat, the components of the printed circuit board are recessed to as small an extent as possible and air ducts are incorporated in order to ensure that the keys are ventilated in relation to one another.

A keyboard for secure data entry is provided. The keyboard comprises at least one or more of data entry buttons that can be depressed by a user. For each of the data entry buttons, a button actuator is provided that is movable upon the user depressing the respective data entry button and a primary capacitive sensor is provided that is arranged to determine movement of the button actuator of the respective data entry button by capacitance sampling. The button actuator is at least partly made from a conductive material. The button actuator is coupled to a defined electric potential at least during the capacitance sampling to shield the primary capacitive sensor from eavesdropping.

A keyboard for secure data entry is provided. The keyboard comprises at least one or more of data entry buttons that can be depressed by a user. For each of the data entry buttons, a button actuator is provided that is movable upon the user depressing the respective data entry button and a primary capacitive sensor is provided that is arranged to determine movement of the button actuator of the respective data entry button by capacitance sampling. The button actuator is at least partly made from a conductive material. The button actuator is coupled to a defined electric potential at least during the capacitance sampling to shield the primary capacitive sensor from eavesdropping.

Mechanical keypads are disclosed. According to one embodiment, a mechanical keypad may include a key cap comprising a post extending from a bottom surface thereof; a structural element comprising a passage configured to receive the post therethrough; and a key securing device that securely receives, through the passage, the post in a recess or opening formed therein, and comprising a key switch interface on a lower surface thereof. The key cap and the key securing device may move substantially in unison when the key post is securely received in the key securing device.

A radio-electric antenna is shaped to be positioned in proximity to an insertion hole for a smart-card reader of a payment terminal.

A support element of a keypad included in a keyboard of a data input device. The support element puts at least one dummy key of a printed circuit board under pressure.

A security element for a data input device and a method for detecting intrusion in the data input device. The security element has a shape suited to closing contacts via each of two extremities respectively on first and second printed-circuit boards of the data input device when the data input device is in the closed position. The extremities are not electrically connected to each other.