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This study aims to develop a framework for inferring keystrokes on mobile devices by exploiting WiFi signals.

October 24, 2016

When CSI Meets Public WiFi

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This study aims to develop a framework for inferring keystrokes on mobile devices by exploiting WiFi signals.
Developed WindTalker to collect channel state information (CSI) through public WiFi hotspots.
Jointly analyzed CSI and network traffic during password entry to infer keystroke inputs.
Implemented WindTalker on multiple mobile devices and evaluated its practicality against Alipay.
Achieved high successful rate for password inference during sensitive input periods.
Showed that keystrokes can be inferred without any direct access to the target device or installation of malware.

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Randomized trial demonstrates effective keystroke inference using public WiFi, suggesting significant security risks for mobile users.

Li et al. (2016) studied this question.

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