Evaluation of Keystroke Dynamics Authentication Systems: Analysis of Physical and Touch Screen Keyboards

Evaluation of Keystroke Dynamics Authentication Systems: Analysis of Physical and Touch Screen Keyboards

Moustafa Dafer (Rafik Hariri University, Lebanon) and Mohamad El-Abed (Rafik Hariri University, Lebanon)
DOI: 10.4018/978-1-5225-0703-1.ch014
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Keystroke dynamics authentication systems have shown promising results to be used in e-commerce and banking applications. However, this modality suffers from several limitations decreasing their widespread of use in daily applications. This chapter addresses the evaluation of keystroke dynamics authentication systems. The chapter provides an evaluation framework to be used when designing and comparing such systems. It also provides an analysis study of the collected features using a physical and touch screen keyboards. This chapter is dedicated to researchers and engineers who need to quantify the usability of their developed keystroke dynamics systems.
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Keystroke Dynamics Technology

Keystroke Dynamics Information

Keystroke dynamics technology is used to discriminate individuals based on their way of typing a text (such as a password). An ideal authentication system should respect the following properties:

  • Universality: All individuals must be characterized by this information.

  • Uniqueness: This information must be as dissimilar as possible for two different individuals.

  • Permanency: It should be present during the whole life span of an individual.

  • Collectability: It can be measured in an easy manner.

  • Acceptability: It concerns the possibility of a real use by users.

Table 1 presents a comparison study of biometric modalities in terms of universality, uniqueness, permanency, collectability and acceptability. From this table, we can deduce that no biometric information satisfies simultaneously all these properties. As for keystroke dynamics, it provides a good performance. However, the users’ typing behavior changes with mood and time thus permanency is not guaranteed.

Table 1.
Comparison study of biometric modalities in terms of universality (U), uniqueness (N), permanency (P), collectability (C), acceptability (A) and performance (E). For the performance, the number of stars is related to the modality’s performance (i.e., EER) in the literature (Mahier et al., 2008).
Keystroke DynamicsYesYesPoorYesYes****
Hand GeometryYesNoYesYesYes****

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