When you hold a mobile phone in hand and put your finger on the screen area where you want to tap, you move phone a little.
These deviations can be measured with a built-in gyroscope and accelerometer and use for UI-redressing attack.
You probably won't react timely to take off your finger while pressing the screen even if you see some other graphic object (such as window or button) on the area where you are going to press.
Funny video:
Funny video:
Advanced mobile UI redressing attack by d0znpp on GoAnimate
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