38 野に咲く名無し@転載禁止 2024/07/19 (金) 03:57:43.487 ID:???-127335157100
A Simple Firmware Update Completely Hides a Device’s Bluetooth Fingerprint
https://today.ucsd.edu/story/a-simple-firmware-update-completely-hides-a-devices-bluetooth-fingerprint
The current approach taken by smartphone companies to make the devices hard to track by their Bluetooth signals is to randomly change the phone’s identity, its MAC address. However, that doesn’t address the physical-layer fingerprints inherent in each device’s transmissions due to unique hardware imperfections.
All wireless devices have small manufacturing imperfections in the hardware used to emit these beacons that are unique to each device. These fingerprints are an accidental byproduct of the manufacturing process. These imperfections in Bluetooth hardware result in unique distortions, which can be used as a fingerprint to track a specific device.