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Performance Metrics and Models for Continuous Authentication Systems
Abstract
Continuous Authentication (CA) systems represent a new class of security systems that are increasingly the focus of much attention in the research literature. CA departs from the traditional (static) authentication scheme by repeating several times the authentication process dynamically throughout the entire login session; the main objectives are to detect session hijacking and ensure session security. As the technology gains in maturity and becomes more diverse, it is essential to develop common and meaningful evaluation metrics that can be used to compare and contrast between existing and future schemes. So far, all the CA systems proposed in the literature were by default evaluated using the same accuracy metrics used for static authentication systems. As an alternative, we discuss in this chapter dynamic accuracy metrics that better capture the continuous nature of CA activity. Furthermore, we introduce and study diverse and more complex forms of the Time-To-Authenticate (TTA) metrics corresponding to the authentication delay. We study and illustrate empirically the proposed metrics and models using a combination of real and synthetic data samples.
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