BlueShift: Probing Adaptive Frequency Hopping in Bluetooth
Tommy Chin, Noah Korzak, Kun Sun · 2023
Bluetooth technology is ubiquitous in today's world with the adoption of mobile phones, wearable media, and Internet-of-Things devices. Adaptive Frequency Hoping (AFH) enables Bluetooth-based technology to frequently change the corresponding wireless communication channel for user privacy purposes and signal noise reduction. The continuous switching of channel frequencies in AFH conceptually mirrors a moving target defense approach, as AFH increases the difficulty for adversaries to probe and monitor Bluetooth devices. In this short paper, we propose~\product, a systematic approach to defeat AFH in practice by identifying and tracking hopping patterns for Bluetooth Low Energy devices. Our real-world experiments demonstrate plausibility of the proposed approach and identify key areas to enhance AFH's effectiveness as an MTD.