The coronavirus disease 2019 (COVID-19) pandemic has caused an unprecedented health crisis for the global. Digital contact tracing, as a transmission intervention measure, has shown its effectiveness on pandemic control. Despite intensive research on digital contact tracing, existing solutions can hardly meet users' requirements on privacy and convenience. In this paper, we propose BU-Trace, a novel permissionless mobile system for privacy-preserving intelligent contact tracing based on QR code and NFC technologies. First, a user study is conducted to investigate and quantify the user acceptance of a mobile contact tracing system. Second, a decentralized system is proposed to enable contact tracing while protecting user privacy. Third, an intelligent behavior detection algorithm is designed to ease the use of our system. We implement BU-Trace and conduct extensive experiments in several real-world scenarios. The experimental results show that BU-Trace achieves a privacy-preserving and intelligent mobile system for contact tracing without requesting location or other privacy-related permissions.
翻译：2019年科罗纳病毒(COVID-19)大流行给全球造成了前所未有的健康危机。数字联系追踪作为一种传输干预措施,已经显示了其在控制大流行病方面的效力。尽管对数字联系追踪进行了深入的研究,但现有的解决办法很难满足用户对隐私和方便的要求。在本文中,我们提议使用BU-Trace,这是一个基于QR码和NFC技术的新的无许可证的隐私智能联系追踪移动系统。首先,进行用户研究,以调查和量化用户对移动联系追踪系统的接受程度。第二,提议采用分散化系统,以便能够在保护用户隐私的同时进行联系追踪。第三,智能行为探测算法旨在方便我们系统的使用。我们实施了BU-Trace,并在几种现实世界情景中进行了广泛的实验。实验结果表明,BU-Trace在不要求地点或其他与隐私有关的许可的情况下实现了一个保密和智能的移动追踪系统。
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