Researchers at Michigan State University have found a way to unlock a smartphone protected by a fingerprint, by using an inkjet printer. The researchers, Kai Cao and Anil K. Jain, used a special conductive ink and paper made by a company called AgIC. They also noted that the fingerprint of the user has to be scanned at a resolution of 300dpi or higher. Before printing, though, the image of the scanned fingerprint needs to be reversed.
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