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There has been a flurry of research into using the various sensors on your phone to steal data in surprising ways. Here's another: using the phone's ambient light sensor to detect what's on the screen. It's a proof of concept, but the paper's general conclusions are correct:
There is a lesson here that designing specifications and systems from a privacy engineering perspective is a complex process: decisions about exposing sensitive APIs to the web without any protections should not be taken lightly. One danger is that specification authors and browser vendors will base decisions on overly general principles and research results which don't apply to a particular new feature (similarly to how protections on gyroscope readings might not be sufficient for light sensor data).
from Schneier on Security http://ift.tt/2oPyN3k
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