Fingerprint Attack Against Touch-Enabled Devices
Oily residues left by tapping fingers on a touch screen may breach user privacy. In this paper, the authors introduce the fingerprint attack against touch-enabled devices. They dust the touch screen surface to reveal fingerprints, and use an iPhone camera to carefully photograph fingerprints while striving to remove the virtual image of the phone from the finger-print image. They then sharpen the fingerprints in an image via various image processing techniques and design effective algorithms to automatically map fingerprints to a keypad in order to infer tapped passwords.