JPWO2020185257A5 - - Google Patents

Claims (18)

A keyboard for secure data entry, comprising:
one or more data entry buttons that can be pressed by a user;
For each of the data entry buttons,
a button actuator movable when the user presses the respective data entry button;
a primary capacitive sensor positioned to determine movement of the button actuator of the respective data entry button by capacitive sampling;
said button actuator is made at least partially of an electrically conductive material;
The keyboard, wherein the button actuator is coupled to a defined potential to shield the primary capacitive sensor from interception, at least during the capacitive sampling. 2. The keyboard of claim 1, wherein the primary capacitive sensor is a mutual capacitive sensor. 3. The keyboard of claim 1 or 2, further comprising shield removal detection circuitry for determining tampering with one or more of the button actuators. 4. The method of claim 3, wherein the shield removal detection circuit is configured to erase data and/or suspend operation of the keyboard when tampering with one or more of the button actuators is determined. keyboard as described. 5. The keyboard of claim 3 or 4, wherein the shield removal detection circuitry includes secondary capacitive sensors for each of the data entry buttons. 6. The keyboard of claim 5, wherein the secondary capacitive sensor is positioned between the button actuator and the primary capacitive sensor. A keyboard according to claim 5 or 6, wherein the secondary capacitive sensor is a self-capacitive sensor. The keyboard of any one of claims 5-7, further comprising at least one printed circuit board containing one or more of the primary capacitive sensor and the secondary capacitive sensor. 9. The keyboard of claim 8, wherein the primary capacitive sensor is located in an intermediate layer of the printed circuit board. A keyboard as claimed in any preceding claim, wherein the button actuators are dome-shaped. A keyboard as claimed in any preceding claim, wherein the button actuators are made of metal. A keyboard as claimed in any preceding claim, comprising a plurality of data entry buttons arranged in a matrix. 13. The keyboard of Claim 12, wherein the plurality of data entry buttons are arranged to form a numeric keypad. a keyboard controller configured to control at least the capacitive sampling of the primary capacitive sensor and to couple the button actuator to the defined potential during at least the capacitive sampling; A keyboard as claimed in any one of claims 1 to 13, comprising: A keyboard as claimed in any preceding claim, wherein the defined potential is ground. A point of sale device,
a point of sale transaction processor;
one or more data entry buttons that can be pressed by a user;
For each of the data entry buttons,
a button actuator movable when the user presses the respective button;
a primary capacitive sensor positioned to determine movement of the button actuator of the respective data entry button by capacitive sampling;
said button actuator is made at least partially from an electrically conductive material;
The point of sale device, wherein the button actuator is coupled to a defined potential to shield the primary capacitive sensor from interception at least during the capacitive sampling. A method of secure data entry with a keyboard, wherein the keyboard includes one or more data entry buttons that can be pressed by a user, each of the data entry buttons being activated by the user pressing the respective data entry button. then comprising a button actuator movable and at least partially made of an electrically conductive material, the keyboard comprising a primary capacitive sensor, the method comprising:
sampling the primary capacitive sensor to determine movement of the button actuator;
coupling the button actuator to a defined potential to shield the primary capacitive sensor from interception at least during the sampling. Method according to claim 17, wherein the keyboard is configured according to any one of claims 1-15 .