The term "biometrics" is derived from the Greek words "bio", meaning "life", and "metrics", meaning "to measure", and it is a method through which we can establish the identity of a person based on physical or behavioral attributes of that person. Continuous Authentication (CA) systems represent a new generation of security mechanisms that continuously monitor user behavioral biometrics and use this as basis to re-authenticate periodically throughout a login session. The idea of continuous authentication emerged in the early 2000s, in part due to heightened security concerns brought about after 9/11. Interest in this technology has been increasing since then, both in academia and industry.
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