Name: Can Websites Track You Using Your Phone's Battery Life? - Shadowproof
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Can Websites Track You Using Your Phone's Battery Life? - Shadowproof

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From “” on :A little-known feature of the HTML5 specification means that websites can find out how much battery power a visitor has left on their laptop or smartphone – and now, security researchers have warned that that information can be used to track browsers online.The battery status API is currently supported in the Firefox, Opera and Chrome browsers, and was introduced by the World Wide Web Consortium (W3C, the organisation that oversees the development of the web’s standards) in 2012, with the aim of helping websites conserve users’ energy. Ideally, a website or web-app can notice when the visitor has little battery power left, and switch to a low-power mode by disabling extraneous features to eke out the most usage.W3C’s specification explicitly frees sites from needing to ask user permission to discover they remaining battery life, arguing that “the information disclosed has minimal impact on privacy or fingerprinting, and therefore is exposed without permission grants”. But in a new paper from four French and Belgian security researchers, that assertion is questioned.The researchers point out that the information a website receives is surprisingly specific, containing the estimated time in seconds that the battery will take to fully discharge, as well the remaining battery capacity expressed as a percentage. Those two numbers, taken together, can be in any one of around 14 million combinations, meaning that they operate as a potential ID number. What’s more, those values only update around every 30 seconds, however, meaning that for half a minute, the battery status API can be used to identify users across websites.Thanks to SP’s for this link!Shadowproof is a financially independent news organization. All of our funding comes from small donations made by readers like you.We use your donations to hire freelance writers and cover our operating costs. Monthly membership subscriptions give us the stability we need to make plans while ensuring our organization does not depend on grants or major funders. If you like what you read, support our writers with a donation today.&nbsp;

From “” on :A little-known feature of the HTML5 specification means that websites can find out how much battery power a visitor has left on their laptop or smartphone – and now, security researchers have warned that that information can be used to track browsers online.The battery status API is currently supported in the Firefox, Opera and Chrome browsers, and was introduced by the World Wide Web Consortium (W3C, the organisation that oversees the development of the web’s standards) in 2012, with the aim of helping websites conserve users’ energy. Ideally, a website or web-app can notice...

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