Inaudible Voice Commands: The Long-Range Attack and Defense

on YouTube ↗24m

" summary

Paper demonstrates a practical inaudible command that reaches 25 ft range (24–30 ft for wake-word, shorter for full-sentence) using a hexagonal array of 61 piezoelectric speakers driven up to 6 W and an optimized frequency‑chopping algorithm that minimizes audible low‑frequency leakage by exploiting the human hearing threshold. Attack reliably triggers Amazon Echo, iPhone Siri and Samsung assistants; range grows with amplifier power. Defense is a software forensic called LipRead that uses sub‑50 Hz energy, correlation, and DC‑bias features to detect attacks with ~99% accuracy.

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" chapters (6)

1. 0:00Inaudible acoustic attacks
2. 2:50Mechanism of microphone
3. 6:43Long-range attack design
4. 11:27Experimental evaluation
5. 13:37Defending against attacks
6. 16:59Conclusion and Q&A

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