用雷达监测呼吸时保护用户隐私,防止身份泄露。
Adaptive Attribute-Decoupled Encryption for Trusted Respiratory Monitoring in Resource-Limited Consumer Healthcare
- 通过分解信号分离呼吸与个人特征,实现隐私保护
- 采用噪声干扰和学习型相位算法彻底消除身份信息
- 在信号受扰下仍能精准检测呼吸,适合低资源设备
呼吸监测在现代医疗服务中至关重要。由于非接触、基于雷达的监测具有显著优势,已受到学术界和产业界广泛关注。然而,消费级雷达数据不可避免地包含用户敏感身份信息(USI),可能被恶意利用导致隐私泄露。为此,本文提出可信呼吸监测范式Tru-RM,结合变分模态分解(VMD)与对抗损失加密技术,实现通过无线信号自动监测呼吸的同时有效匿名化USI。Tru-RM的核心包括:属性特征解耦(AFD)用于将原始雷达信号分解为通用呼吸成分、个人差异成分及其他无关成分;灵活扰动加密器(FPE)通过大噪声抑制无关成分,并使用含学习强度参数的相位噪声算法消除个人差异成分中的USI,实现完全身份信息加密而不影响呼吸特征;扰动容错网络(PTN)则采用迁移广义域无关网络,在波形大幅变化时仍能准确检测呼吸。基于多种检测距离、呼吸模式和持续时间的大量实验表明,Tru-RM在强匿名性与受扰呼吸波形高精度检测方面表现优异。
原文摘要 · Abstract (English)
Respiratory monitoring is an extremely important task in modern medical services. Due to its significant advantages, e.g., non-contact, radar-based respiratory monitoring has attracted widespread attention from both academia and industry. Unfortunately, though it can achieve high monitoring accuracy, consumer electronics-grade radar data inevitably contains User-sensitive Identity Information (USI), which may be maliciously used and further lead to privacy leakage. To track these challenges, by variational mode decomposition (VMD) and adversarial loss-based encryption, we propose a novel Trusted Respiratory Monitoring paradigm, Tru-RM, to perform automated respiratory monitoring through radio signals while effectively anonymizing USI. The key enablers of Tru-RM are Attribute Feature Decoupling (AFD), Flexible Perturbation Encryptor (FPE), and robust Perturbation Tolerable Network (PTN) used for attribute decomposition, identity encryption, and perturbed respiratory monitoring, respectively. Specifically, AFD is designed to decompose the raw radar signals into the universal respiratory component, the personal difference component, and other unrelated components. Then, by using large noise to drown out the other unrelated components, and the phase noise algorithm with a learning intensity parameter to eliminate USI in the personal difference component, FPE is designed to achieve complete user identity information encryption without affecting respiratory features. Finally, by designing the transferred generalized domain-independent network, PTN is employed to accurately detect respiration when waveforms change significantly. Extensive experiments based on various detection distances, respiratory patterns, and durations demonstrate the superior performance of Tru-RM on strong anonymity of USI, and high detection accuracy of perturbed respiratory waveforms.
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