用声学超材料实现移动中远距离窃听，成功率超80%
SuperEar: Eavesdropping on Mobile Voice Calls via Stealthy Acoustic Metamaterials
- 设计可3D打印的声学超材料，聚焦并增强远处通话声波
- 实测在4.6米外恢复通话音频成功率超80%，距离为以往两倍
- 低成本便携设备即可实现，揭示新型隐蔽隐私威胁
声学窃听是隐私风险，但现有攻击在真实户外移动通话场景中极少奏效。本文提出SuperEar，首个利用声学超材料在该类场景下可靠捕获对话的便携系统。实验表明，其原型可有效增强微弱信号，以紧凑设计覆盖全语音频范围，并降低噪声与失真，生成清晰音频。该系统仅需低成本3D打印部件与现成硬件即可实现。实验结果证明，SuperEar在4.6米距离上恢复电话通话的成功率超过80%，远超以往方法。研究揭示了超材料技术带来的新型隐私威胁，亟需关注。
原文摘要 · Abstract (English)
Acoustic eavesdropping is a privacy risk, but existing attacks rarely work in real outdoor situations where people make phone calls on the move. We present SuperEar, the first portable system that uses acoustic metamaterials to reliably capture conversations in these scenarios. We show that the threat is real as a practical prototype can be implemented to enhance faint signals, cover the full range of speech with a compact design, and reduce noise and distortion to produce clear audio. We show that SuperEar can be implemented from low-cost 3D-printed parts and off-the-shelf hardware. Experimental results show that SuperEar can recover phone call audio with a success rate of over 80% at distances of up to 4.6 m - more than twice the range of previous approaches. Our findings highlight a new class of privacy threats enabled by metamaterial technology that requires attention.
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