Your battery status is being used to track you online

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running low on battery
Running low on power? Now people can track you with that. Photograph: Martin Abegglen/Flickr

The Guardian UK tells us that – Battery status indicators are being used to track devices, say researchers from Princeton University – meaning warnings of privacy exposure have come to pass

A little-known web standard that lets site owners tell how much battery life a mobile device has left has been found to enable tracking online, a year after privacy researchers warned that it had the potential to do just that.

The battery status API was introduced in HTML5, the fifth version of the code used to lay out the majority of the web, and had already shipped in Firefox, Opera and Chrome by August 2015. It allows site owners to see the percentage of battery life left in a device, as well as the time it will take to discharge or the time it will take to charge, if connected to a power source.

Intended to allow site owners to serve low-power versions of sites and web apps to users with little battery capacity left, soon after it was introduced, privacy researchers pointed out that it could also be used to spy on users. The combination of battery life as a percentage and battery life in seconds provides offers 14m combinations, providing a pseudo-unique identifier for each device.  … read more

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