arXiv AI By Simon Parkinson, Saad Khan, Na Liu, Qing Xu

Template Ageing and Longitudinal Verification in Fixed-Text Keystroke Dynamics: A Subject-Disjoint Study Across Eight Weeks

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The study investigates how behavioural biometric templates degrade over time by collecting a longitudinal dataset of 40 fixed passwords typed weekly for eight weeks. Four matching mechanisms—scaled-Manhattan, gradient-boosted classifier, recurrent embedding, and Transformer—were evaluated under a subject-disjoint protocol, revealing that error rates increase steadily with the enrolment-to-query gap, yet the choice of mechanism has a larger impact on accuracy than the ageing rate. The results show that while ageing is systematic, it does not reorder the relative performance of the mechanisms, suggesting that re-enrolment scheduling rather than matcher selection should manage ageing.

Machine-generated by The Flow from the publisher's headline and feed description — not written or checked by a human. The full article lives at arXiv AI.

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