UltraSnoop: Placement-agnostic Keystroke Snooping via Smartphone-based Ultrasonic Sonar

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Yanchao Zhao, Yiming Zhao, Si Li, Hao Han, Lei Xie

Published: 01 Jan 2023, Last Modified: 16 May 2025ACM Trans. Internet Things 2023EveryoneRevisionsBibTeXCC BY-SA 4.0