Researchers studied the practicality of using free-form gestures for access authentication on smart phones and tablets.
Credit: Michael Sherman, Gradeigh Clark, Yulong Yang, Shridatt Sugrim, Arttu Modig, Janne Lindqvist, Antti Oulasvirta, and Teemu Roos; Rutgers University, Max-Planck Institute for Informatics and University of Helsinki
To protect your financial and personal data, most mobiles come with PIN-based security, biometrics or number grids that require you to retrace a particular pattern to access your device.
From Scientific American
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