Encrypting touch-sensitive display
View Patent ↗A hardware encryption device comprises: a touch panel controller; and a cryptographic engine in communication with the touch panel controller. The touch panel controller receives co-ordinates from the cryptographic engine corresponding to an area on a touch panel selected by a user. The cryptographic engine is operable to discriminate between a selection in a secure area on a screen and a selection in a non-secure area on a screen, and to action the selection differently depending on whether the selection is in a secure area or a non-secure area.
1. A method of controlling an encrypting touch-sensitive display, the method comprising:
creating a pad zone on a screen to be rendered on the touch-sensitive display;
creating touch areas within the pad zone, each touch area having a value;
assigning an operating mode to the touch areas within the pad zone, where the operating mode is either: (i) secure, for which the value associated with each touch area is not returned to an application on selection of that touch area; or (ii) open, for which the value associated with each touch area is returned to an application through a touch area input queue on selection of that touch area;
providing an option to create a mouse area outside the pad zone on the screen to be rendered on the touch-sensitive display, but only where the operating mode of the touch areas within the pad zone is the open mode; and
enabling a touch selection within the mouse area to be transferred to an operating system input queue instead of the touch area input queue.
2. A method according to claim 1 , wherein the step of creating a pad zone on a screen to be rendered on the touch-sensitive display is implemented by conveying co-ordinates of the pad zone from an application to an engine located within a hardware encryption device.
3. A method according to claim 1 , wherein the step of creating a pad zone on a screen may be implemented on each occasion that a customer input via a keypad or keyboard is required.
4. A method according to claim 1 , wherein the step of creating a pad zone on a screen and creating touch areas within the pad zone may be implemented simultaneously using a CEN XFS format command.
5. An encrypting touch-sensitive display system comprising:
a display for rendering a screen created by an application;
a transparent, touch-sensitive panel in registration with the display and mounted thereto;
a touch-sensitive panel controller in communication with the touch-sensitive panel and operable to receive co-ordinates therefrom, the received coordinates corresponding to an area of the touch-sensitive panel touched by a customer;
a cryptographic engine in communication with the touch-sensitive panel controller and operable to discriminate between selection of a touch area within a pad zone in open mode and in secure mode; and
a tamper-responsive mechanism sealingly enclosing the display, touch-sensitive panel, touch-sensitive panel controller, and cryptographic engine, to (i) detect disassembly or tampering of the coupled components, and (ii) reset the cryptographic engine in response thereto including a micro-switch to detect disassembly of the system and a membrane to detect penetration of a component within the system.
6. An encrypting touch-sensitive display system according to claim 5 , further comprising a driver suite for requesting the hardware encryption device to perform functions and route responses to a requesting application.
7. An encrypting touch-sensitive display system according to claim 6 , further comprising a keypad service provider for receiving standard commands and translating these commands for the driver suite to implement.
8. An encrypting touch-sensitive display control system according to claim 7 , wherein the system further comprises a touch panel proxy for routing mouse click events from either the hardware encryption device or the driver suite to an operating system input queue.