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Ambient light sensors can reveal your device activity. How big a threat is it?

Ambient light sensors, while designed to improve power consumption and reduce eye strain by adjusting screen brightness, could also pose a privacy threat. Research from Massachusetts Institute of Technology has indicated that under specific conditions, these sensors could allow external parties to monitor user actions, presumed to be private, such as specific screen gestures. Although various limitations make immediate threats unlikely, the researchers emphasize the importance of public awareness regarding potential future threats.

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