用声学超材料保护语音助手，防无声攻击不改硬件。
MetaGuardian: Enhancing Voice Assistant Security through Advanced Acoustic Metamaterials
- 用超材料单元互阻抗扩展滤波范围至16-40kHz，拦截宽频无声攻击。
- 通过螺旋结构精准干扰对抗攻击，不影响正常语音识别。
- 通用结构设计适配多种设备，兼顾便携性与防护效果。
我们提出MetaGuardian，一种基于声学超材料的语音助手（VA）防护系统。该系统可直接集成于各类智能设备外壳中，无需额外软件支持或更改底层硬件，即可有效防御无声、对抗性及激光攻击，保障使用体验。为实现此目标，MetaGuardian利用超材料单元间的互阻抗效应，将信号滤波范围扩展至16-40 kHz，有效屏蔽宽带无声攻击；同时采用精心设计的螺旋空间结构，精准干扰对抗性攻击，确保语音助手正常运行。此外，其通用结构设计可灵活适配多种智能设备，在便携性与防护效能间取得平衡。在受控测试环境中，MetaGuardian对各类攻击类型均表现出高防御成功率。
原文摘要 · Abstract (English)
We present MetaGuardian, a voice assistant (VA) protection system based on acoustic metamaterials. MetaGuardian can be directly integrated into the enclosures of various smart devices, effectively defending against inaudible, adversarial and laser attacks without relying on additional software support or altering the underlying hardware, ensuring usability. To achieve this, MetaGuardian leverages the mutual impedance effects between metamaterial units to extend the signal filtering range to 16-40 kHz to effectively block wide-band inaudible attacks. Additionally, it adopts a carefully designed coiled space structure to precisely interfere with adversarial attacks while ensuring the normal functioning of VAs. Furthermore, MetaGuardian offers a universal structural design, allowing itself to be flexibly adapted to various smart devices, striking a balance between portability and protection effectiveness. In controled evaluation environments, MetaGuardian achieves a high defense success rate against various attack types, including adversarial, inaudible and laser attacks.
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