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Summary
This summary is machine-generated.

Online signature dynamics vary across different devices, impacting mobile biometric authentication. This study shows cross-device mismatches reduce verification accuracy, highlighting the need for adaptable authentication systems.

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Dynamic Time Warpingbehavioral biometricscross-device variabilitymobile devicesonline signature verificationstylus-based input

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Area of Science:

  • Biometrics
  • Human-Computer Interaction
  • Cybersecurity

Background:

  • Mobile biometric authentication is crucial for secure digital transactions.
  • Users often enroll on one device and verify on another, creating potential mismatches.
  • Understanding cross-device variability in biometric data is essential for reliable authentication.

Purpose of the Study:

  • To investigate cross-device variability in online signature dynamics captured on different Samsung devices.
  • To evaluate the impact of device form factor and writing area on signature verification accuracy.
  • To provide evidence for the need for cross-device-aware mobile authentication systems.

Main Methods:

  • Collected signature data (trajectories, strokes, pressure) on a smartphone and tablet using a unified web interface.
  • Divided genuine signatures into reference and test sets for intra-device and cross-device comparisons.
  • Utilized Dynamic Time Warping (DTW) on multivariate time series to evaluate signature similarity.

Main Results:

  • Signature dissimilarity was lower in intra-device comparisons (same device).
  • Higher signature distances and ROC degradation were observed under cross-device mismatch conditions.
  • Exploratory evidence suggests device heterogeneity significantly affects mobile signature verification performance.

Conclusions:

  • Device heterogeneity is a practical challenge in mobile signature verification.
  • Cross-device mismatches can reduce the reliability of biometric authentication.
  • Future authentication systems require cross-device-aware designs for real-world mobile environments.