System and method for mission critical screen validation on commercial displays

A processor-implemented method in a high integrity device for verifying the integrity, continuity, and availability (ICA) of information displayed on an uncertified display, the method comprising:

• creating, on the high integrity device by a processor, application data for display on the uncertified display device that includes a subliminal symbol that is periodically embedded in a few out of multiple tens of frames and that is camouflaged in the application data using steganography;
• transmitting the application data to the uncertified display device for display;
• receiving, at the high integrity device from a screen capture system, images of the application data displayed on the display screen of the uncertified display device that includes the subliminal symbol that is camouflaged using steganography;
• determining, at the high integrity device, whether the subliminal symbol is detected in the captured images of the application data by extracting the symbol from the captured images and comparing the extracted symbol to an expected symbol;
• determining that the application data is not corrupted when the extracted symbol matches the expected symbol;
• identifying a loss of ICA when the subliminal symbol is not detected in the application data displayed on the uncertified display device or does not match the expected symbol;
• and
• causing an annunciation indicating the loss of ICA or disabling the display screen of the uncertified display device when a loss of ICA is identified.

A server that is certified to generate mission critical data, the server configured to:

• create application data for display on an uncertified display device that includes a subliminal symbol that is periodically embedded in a few out of multiple tens of frames and that is camouflaged in the application data using steganography;
• transmit the application data to the uncertified display device for display;
• receive, from a screen capture system, images of the application data displayed on the display screen of the uncertified display device that includes the subliminal symbol that is camouflaged using steganography;
• determine whether the subliminal symbol is detected in captured images of the application data displayed on the uncertified display device by extracting the symbol from the captured images and comparing the extracted symbol to an expected symbol;
• determine that the application data is not corrupted when the extracted symbol matches the expected symbol;
• identify a loss of ICA when the subliminal symbol is not detected in the application data displayed on the uncertified display device or does not match the expected symbol;
• and
• transmit an error indicator when a loss of ICA is identified.