摘要
语音隐私安全对于国家和个人信息安全至关重要.为了确保用户的语音隐私免受窃听,超声波录音干扰技术被广泛采用.此技术利用电子录音设备中的超声波非线性特征,在不影响正常交流的前提下,实现了高效且低成本的窃听录音干扰.然而,现有的语音防窃听技术仍存在安全隐患.由于以往技术仅采用简单的噪声掩盖技术,窃听者能够通过先进的去噪技术恢复语音信息,威胁语音隐私安全.特别地,这些方法的设计主要针对英语语音,对汉语语音的适用性有限.因此,针对汉语语音的隐私保护需求更为迫切.为提高超声波录音干扰的安全性和适用性,本文针对汉语语音隐私保护,设计了一种安全稳健的防窃听方法.本文分析汉语语音独特特征,以此为基础设计一种耦合噪声生成算法,该算法所生成的超声干扰噪声与汉语用户的语音信号紧密耦合、高度相关,因此难以分离,能够有效抵御各种去噪手段.本文充分考虑了窃听者的能力,实现不可恢复的录音干扰,在不影响用户听力及正常交流的情况下,构建了安全的防窃听方案,全面保护用户的语音隐私安全.为验证该方法的有效性,本文设计了超声波录音干扰原型系统.实验结果表明,在6 m的范围内,本文方法能够确保90%以上的用户语音内容无法被窃听者识读,为汉语语音隐私保护提供了强有力的技术支持.
The privacy and security of speech are fundamental to both national and personal information security.To protect users’speeches from being eavesdropped on,ultrasonic microphone jammers are widely utilized.These jammers utilize the nonlinear characteristics of ultrasound in digital recording devices to inject noise into microphones efficiently and cost-effectively,without disrupting normal communication or human hearing.However,existing microphone jammers are vulnerable.They merely introduce simple noise to mask speeches.As a result,eavesdroppers can employ advanced denoising techniques to recover speech information,posing a significant threat to speech privacy and security.Moreover,existing jammers have primarily been designed for English speech,limiting their applicability to Chinese speech.Therefore,there is an urgent need for privacy protection for Chinese speech.To enhance the security and adaptability of ultrasonic microphone jammers,this paper introduces a robust jammer for Chinese speech privacy protection.Based on the unique characteristics of Chinese phonetics,we design a coherent noise generation algorithm,which produces real-time ultrasound noise intimately coupled with the protected speech signal.This noise is designed to be difficult for adversaries to separate from the speech,ensuring that any attempts at eavesdropping will be frustrated.Comprehensively considering the capabilities of the potential adversaries adversary,our proposed jammer realizes the robust protection against eavesdropping.The generated noise cannot be removed by adversaries using state-of-the-art denoising techniques and is imperceptible to human hearing.Thereby,we comprehensively safeguard speech privacy and security.We develop a prototype of the proposed ultrasonic microphone jammer to validate its effectiveness.Experimental results demonstrate that over 90%of protected speeches remain unrecognizable to adversaries within a range of 6 meters under the protection of the proposed jammer,even if the adversary adopts stateof-the-art denoising techniques.Therefore,we provide robust technical support to protect Chinese speech privacy.
作者
高铭
陈奕可
陈佳彤
肖甫
韩劲松
GAO Ming;CHEN Yi-ke;CHEN Jia-tong;XIAO Fu;HAN Jin-song(School of Computer Science,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210023,China;School of Computer Science and Technology,Zhejiang University,Hangzhou,Zhejiang 310007,China)
出处
《电子学报》
北大核心
2025年第3期986-999,共14页
Acta Electronica Sinica
基金
国家杰出青年科学基金(No.62125203)
国家自然科学基金(No.62372400)。
关键词
语音安全与隐私
物联网安全
移动感知与安全
汉语语音
超声波非线性
speech security and privacy
internet of things security
mobile security
Chinese phonetics
ultrasonic non-linearity
