Keystroke dynamics as a biometric for authentication
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Personalized soft-keyboards which adapt to a user's individual typing behavior can reduce typing errors on interactive displays. In multi-user scenarios a personalized model has to be loaded for each participant. In this paper we describe a user identification technique that is based on raw sensor data from an optical touch screen. For classification of users we use a multi-class support vector machine that is trained with grayscale images from the optical sensor. Our implementation can identify a specific user from a set of 12 users with an average accuracy of 97.51% after one keystroke. It can be used to automatically select individual typing models during free-text entry. The resulting authentication process is completely implicit. We furthermore describe how the approach can be extended to automatic loading of personal information and settings.