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iPhone gyroscopes, of all things, can uniquely ID handsets on anything earlier than iOS 12.2

doublelayer Silver badge

An app can probably be more trusted, but the more concerning one is a script on a website. A user can be tracked inside an app by many more reliable mechanisms, so the only benefit to apps. in using this is to try to track a user after they've deleted an app and reinstalled it. Concerning, yes, but not a very frequent thing to do. Meanwhile, sites that can fingerprint via scripts are much more worrying. If it takes a second to do that, lots of sites will do it successfully. If we can extend this to a minute, fewer sites will bother and plenty won't get a chance to finish before the user closes it. Still, I think the best way is to deny sites access to those measurements. If a thing needs those, they can write an app.

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