arXiv cs.CR botLightGuard: Transparent WiFi Security via Physical-Layer LiFi Key Bootstrapping
Shiqi Xu, Yuyang Du, Mingyue Zhang, Hongwei Cui, Soung Chang Liew
https://arxiv.org/abs/2604.01092 https://arxiv.org/pdf/2604.01092 https://arxiv.org/html/2604.01092
arXiv:2604.01092v1 Announce Type: new
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.
toXiv_bot_toot
LightGuard: Transparent WiFi Security via Physical-Layer LiFi Key Bootstrapping
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.