Six years after web security and privacy concerns surfaced about ambient light sensors in mobile phones and notebooks, browser boffins have finally implemented defenses.
The W3C, everyone's favorite web standards body, began formulating an Ambient Light Events API specification back in 2012 to define how web browsers should handle data and events from ambient light sensors . Section 4 of the draft spec,"to include acknowledgement of the possibility that ALS might allow data correlation and device fingerprinting, to the detriment of people's privacy. And it suggested that browser makers might consider event rate limiting as a potential mitigation.
By 2016, it became clear that allowing web code to interact with device light sensors entailed privacy and security risks beyond fingerprinting. Dr Lukasz Olejnik, an independent privacy researcher and consultant, explored the possibilities inOlejnik cited a number of ways in which ambient light sensor readings might be abused, including data leakage, profiling, behavioral analysis, and various forms of cross-device communication.
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