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arXiv · 2409.18213

A Fly on the Wall -- Exploiting Acoustic Side-Channels in Differential Pressure Sensors

Yonatan Gizachew Achamyeleh·Mohamad Habib Fakih·Gabriel Garcia·Anomadarshi Barua·Mohammad Al Faruque
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Abstract

Differential Pressure Sensors are widely deployed to monitor critical environments. However, our research unveils a previously overlooked vulnerability: their high sensitivity to pressure variations makes them susceptible to acoustic side-channel attacks. We demonstrate that the pressure-sensing diaphragms in DPS can inadvertently capture subtle air vibrations caused by speech, which propagate through the sensor's components and affect the pressure readings. Exploiting this discovery, we introduce BaroVox, a novel attack that reconstructs speech from DPS readings, effectively turning DPS into a "fly on the wall." We model the effect of sound on DPS, exploring the limits and challenges of acoustic leakage. To overcome these challenges, we propose two solutions: a signal-processing approach using a unique spectral subtraction method and a deep learning-based approach for keyword classification. Evaluations under various conditions demonstrate BaroVox's effectiveness, achieving a word error rate of 0.29 for manual recognition and 90.51% accuracy for automatic recognition. Our findings highlight the significant privacy implications of this vulnerability. We also discuss potential defense strategies to mitigate the risks posed by BaroVox.

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Yonatan Gizachew Achamyeleh, Mohamad Habib Fakih, Gabriel Garcia, Anomadarshi Barua, Mohammad Al Faruque. 2024-09-26. A Fly on the Wall -- Exploiting Acoustic Side-Channels in Differential Pressure Sensors. https://arxiv.org/abs/2409.18213

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