A Keystroke Biometric Systemfor Long-Text Input

Charles C. Tappert, Sung-Hyuk Cha, Mary Villani and Robert S. Zack
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Charles C. Tappert: Pace University, USA
Sung-Hyuk Cha: Pace University, USA
Mary Villani: Pace University, USA
Robert S. Zack: Pace University, USA

International Journal of Information Security and Privacy (IJISP), 2010, vol. 4, issue 1, 32-60

Abstract: A novel keystroke biometric system for long-text input was developed and evaluated for user identification and authentication applications. The system consists of a Java applet to collect raw keystroke data over the Internet, a feature extractor, and pattern classifiers to make identification or authentication decisions. Experiments on more than 100 participants investigated two input modes—copy and free-text—and two keyboard types—desktop and laptop. The system can accurately identify or authenticate individuals if the same type of keyboard is used to produce the enrollment and questioned input samples. Longitudinal experiments quantified performance degradation over intervals of several weeks and two years. Additional experiments investigated the system’s hierarchical model, parameter settings, assumptions, and sufficiency of enrollment samples and input-text length. Although evaluated on input texts up to 650 keystrokes, the authors found that input of 300 keystrokes, roughly four lines of text, is sufficient for the important applications described.

Date: 2010
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International Journal of Information Security and Privacy (IJISP) is currently edited by Yassine Maleh

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