Author

Erkka Rantahalvari

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#machine learning Preprint Sep 2026

Handwritten Digit Leakage from Smartphone Motion Sensors Across Unseen Users and Phone Models

Digits are thus predictable beyond familiar users and phone models under assumed segmentation, while acquisition-order shortcuts limit conclusions about practical privacy exposure.

C. A. Casado, Erkka Rantahalvari, Matteo Pedone et al. · 0 citations

#machine learning Apr 2026

Selfie-Capture Dynamics as an Auxiliary Signal Against Deepfakes and Injection Attacks for Mobile Identity Verification

The findings support selfie-capture motion as a low-friction auxiliary signal, while leaving cross-device, cross-session, and real injection-attack evaluation as necessary next steps.

Erkka Rantahalvari, Olli Silvén, Z. Boulkenafet et al. · arXiv.org · 1 citation