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Keystroke biometrics with number-pad input

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2 Author(s)
Maxion, R.A. ; Comput. Sci. Dept., Carnegie Mellon Univ., Pittsburgh, PA, USA ; Killourhy, K.S.

Keystroke dynamics is the process of identifying individual users on the basis of their typing rhythms, which are in turn derived from the timestamps of key-press and key-release events in the keyboard. Many researchers have explored this domain, with mixed results, but few have examined the relatively impoverished territory of digits only, particularly when restricted to using a single finger - which might come into play on an automated teller machine, a mobile phone, a digital telephone dial, or a digital electronic security keypad at a building entrance. In this work, 28 users typed the same 10-digit number, using only the right-hand index finger. Employing statistical machine-learning techniques (random forest), we achieved an unweighted correct-detection rate of 99.97% with a corresponding false-alarm rate of 1.51%, using practiced 2-of-3 encore typing with outlier handling. This level of accuracy approaches sufficiency for two-factor authentication for passwords or PIN numbers.

Published in:

Dependable Systems and Networks (DSN), 2010 IEEE/IFIP International Conference on

Date of Conference:

June 28 2010-July 1 2010