The National Security Agency (NSA) is working with Lockheed Martin to develop technology that identifies smartphone users by the speed, pressure, and pattern of their touchscreen swipes. The project is called Mandrake, and it's designed to complement other biometric identifiers.
No two smartphone users have "the same strokes," explains John Mears of Lockheed. "People can forge your handwriting in two dimensions, but they couldn't forge it in three or four dimensions. Three is the pressure you put in, in addition to the two dimensions on the paper. The fourth dimension is time. The most advanced handwriting-type authentication tracks you in four dimensions."
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