That Fingerprint Sensor on Your Phone Is Not as Safe as You Think

  Full human fingerprints are difficult to falsify, but the finger scanners on phones are so small that they read only partial fingerprints. When a user sets up fingerprint security on an Apple iPhone or a phone that runs Google’s Android software, the phone typically takes eight to 10 images of a finger to make it easier to make a match. And many users record more than one finger — say, the thumb and forefinger of each hand. Photo Sample fingerprints that the researchers at N.Y.U. and Michigan State University…

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