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arXiv · 2604.01092

LightGuard: Transparent WiFi Security via Physical-Layer LiFi Key Bootstrapping

Shiqi Xu·Yuyang Du·Mingyue Zhang·Hongwei Cui·Soung Chang Liew
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Abstract

WiFi is inherently vulnerable to eavesdropping because RF signals may penetrate many physical boundaries, such as walls and floors. LiFi, by contrast, is an optical method confined to line-of-sight and blocked by opaque surfaces. We present LightGuard, a dual-link architecture built on this insight: cryptographic key establishment can be offloaded from WiFi to a physically confined LiFi channel to mitigate the risk of key exposure over RF. LightGuard derives session keys over a LiFi link and installs them on the WiFi interface, ensuring cryptographic material never traverses the open RF medium. A prototype with off-the-shelf WiFi NICs and our LiFi transceiver frontend validates the design.

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Shiqi Xu, Yuyang Du, Mingyue Zhang, Hongwei Cui, Soung Chang Liew. 2026-04-01. LightGuard: Transparent WiFi Security via Physical-Layer LiFi Key Bootstrapping. https://arxiv.org/abs/2604.01092

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