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You leave them behind on every surface you touch.

Auth factor that needs to be stolen to be used by attacker is definitely more secure than thing that can be just copied.

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Ok, if there's a way to be absolutely sure that every participating phone, ring, watch or badge is impossible to copy then this is awesome.

You don't wanna get it, right? I just have to trail you in the train or in a coffee or something. Every flat surface you'll touch will have you fingerprint on ... a 5 minute YouTube tutorial is all I have to follow then ... And no, the iPhone is not more secure than any other scanner used before. And as soon as your fingerprints are leaked, there is no way for you to get new fingers, right? So it's okay for replacing the PIN unlock dialog, but that's all.

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