VoiceGuard: An Effective and Practical Approach for Detecting and Blocking Unauthorized Voice Commands to Smart Speakers
VoiceGuard: An Effective and Practical Approach for Detecting and Blocking Unauthorized Voice Commands to Smart Speakers
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DOI：
10.1109/dsn58367.2023.00060
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Xuening Xu;Chenglong Fu;Xiaojiang Du;E. Ratazzi
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文献类型：
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作者：
Xuening Xu;Chenglong Fu;Xiaojiang Du;E. Ratazzi
智能音箱为人们的日常生活带来便利。然而，智能音箱可能会受到各种攻击，执行恶意命令，可能会导致严重的安全问题。针对语音重放攻击和语音合成攻击等复杂攻击的现有解决方案需要对智能扬声器硬件和/或软件进行侵入性修改，这对于一般用户来说是不切实际的。在这项工作中，我们提出了一种新的安全方案- VoiceGuard，可以有效地检测和阻止未经授权的语音命令到智能扬声器。VoiceGuard不需要对智能扬声器的硬件或软件进行任何修改。我们在亚马逊Echo Dot和谷歌Home Mini这两款流行的智能音箱上实现了VoiceGuard的原型，并在三个真实世界的测试平台上评估了该方案，其中包括单用户和多用户场景。实验结果表明，VoiceGuard拦截非法来源发出的恶意语音命令的准确率达到97%，而对用户体验的影响可以忽略不计。
Smart speakers bring convenience to people's daily lives. However, various attacks can be launched against smart speakers to execute malicious commands, which may cause serious safety or security issues. The existing solutions against sophisticated attacks such as voice replay attacks and voice synthesis attacks require intrusive modifications of the smart speaker hardware and/or software, which are impractical for general users. In this work, we present a novel security scheme- VoiceGuard that can effectively detect and block unauthorized voice commands to smart speakers. VoiceGuard does not require any modification to smart speakers' hardware or software. We implement a prototype of VoiceGuard on two popular smart speakers: Amazon Echo Dot and Google Home Mini, and evaluate the scheme in three real-world testbeds, which include both single-user and multi-user scenarios. The experimental results show that VoiceGuard achieves an accuracy of 97% in blocking malicious voice commands issued by illegitimate sources while having a negligible impact on the user experience.