Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for continuous identity authentication based on gesture data. In one aspect, a method includes receiving gesture data corresponding to one or more gestures received on a touch screen of the mobile device from an individual, generating specific features extracted from the one more gestures, comparing the specific features with gesture data collected on the mobile device from a user previously interacting with the mobile device, and verifying that an identity of the individual matches an identity of the previous user.
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