Intrusion detection using a capacitance sensitive touchpad
First Claim
1. A method for performing intrusion detection through monitoring of changes in an environment of a housing for a touch and proximity sensitive device, said method comprising the steps of:
- providing a touch and proximity sensitive device disposed on or within a housing and including a sense electrode that extends beyond a touch sensitive surface and that is dedicated to detection of the environment around the device and the housing and is capable of touch and proximity detection of conductive or dielectric objects that cause an imbalance of electrical charges on at least one electrode of the device;
creating a compensation matrix by transmitting at least one signal pattern from the at least one electrode, receiving at least one response on the sense electrode, and storing the at least one response in the compensation matrix to show an initial imbalance of electrical charges on the at least one electrode as detected by the sense electrode, the compensation matrix being stored in non-volatile memory that is not erased when the device is shut off;
performing an intrusion detection procedure by transmitting the at least one signal pattern from the at least one electrode, receiving at least one new response on the sense electrode and comparing the at least one new response to the initial imbalance stored in the compensation matrix stored in the non-volatile memory to determine if the environment around the device or the housing has changed;
performing an action apart from normal touch and proximity sensitive device operation of detection and tracking of objects on a surface thereof, if it is determined that the at least one new response is different from the initial imbalance stored in the compensation matrix, the action being selected from the group of actions comprised of taking no action and letting the touch and proximity sensitive device to continue operating, sending an alert signal, shutting down the device, or a combination of these actions.
1 Assignment
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Accused Products
Abstract
A capacitance sensitive proximity and touch-sensitive detection device having an XY electrode grid sensor, wherein a compensation matrix is created when the capacitance sensitive touchpad is installed within a PIN Entry Device (PED), wherein the compensation matrix enables the capacitance sensitive touchpad to compensate and be balanced for the operating environment of the PED, and wherein physical keys of a keypad can be also be individually identified as an actuated key by using a unique “key profile” for each key, and wherein the insertion of a foreign conductive and/or dielectric material such as an intruding sensor in proximity of the XY electrode grid sensor of the touchpad will cause an imbalance in the electrodes on the capacitance sensitive proximity and touch-sensitive detection device, thereby alerting detection circuitry that tampering has occurred with the PED.
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Citations
21 Claims
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1. A method for performing intrusion detection through monitoring of changes in an environment of a housing for a touch and proximity sensitive device, said method comprising the steps of:
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providing a touch and proximity sensitive device disposed on or within a housing and including a sense electrode that extends beyond a touch sensitive surface and that is dedicated to detection of the environment around the device and the housing and is capable of touch and proximity detection of conductive or dielectric objects that cause an imbalance of electrical charges on at least one electrode of the device; creating a compensation matrix by transmitting at least one signal pattern from the at least one electrode, receiving at least one response on the sense electrode, and storing the at least one response in the compensation matrix to show an initial imbalance of electrical charges on the at least one electrode as detected by the sense electrode, the compensation matrix being stored in non-volatile memory that is not erased when the device is shut off; performing an intrusion detection procedure by transmitting the at least one signal pattern from the at least one electrode, receiving at least one new response on the sense electrode and comparing the at least one new response to the initial imbalance stored in the compensation matrix stored in the non-volatile memory to determine if the environment around the device or the housing has changed; performing an action apart from normal touch and proximity sensitive device operation of detection and tracking of objects on a surface thereof, if it is determined that the at least one new response is different from the initial imbalance stored in the compensation matrix, the action being selected from the group of actions comprised of taking no action and letting the touch and proximity sensitive device to continue operating, sending an alert signal, shutting down the device, or a combination of these actions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for performing intrusion detection through monitoring of changes in an environment around a keypad through changes detectable by a proximity sensor, said method comprising:
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providing a touch and proximity sensitive touchpad disposed under a keypad, wherein the touchpad includes a sense electrode that that extends beyond a touch sensitive surface and that is dedicated to detection of the environment around the keypad and is capable of touch and proximity detection of conductive or dielectric objects that cause an imbalance of electrical charges on at least one electrode of the touchpad; providing a plurality of keys in the keypad that is disposed over the touchpad; profiling each key of the plurality of keys by creating a compensation matrix by pressing each key and then measuring a response on the sense electrode, and storing the response for each key in the compensation matrix, the compensation matrix being stored in non-volatile memory that is not erased when the device is shut off; performing an intrusion detection procedure by pressing a key, measuring a new response by the sense electrode for that key, and comparing the new response to the stored response for that key in the compensation matrix stored in the non-volatile memory to determine if the environment around the keypad has changed; and performing an action if it is determined that the new response is different from the stored response in the compensation matrix, the action being selected from the group of actions comprised of taking no action and letting the keypad continue operating, sending an alert signal, shutting down the keypad, or a combination of these actions. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification