The USG is a firewall for your USB ports, protecting your computer from [BadUSB](https://srlabs.de/badusb/). It connects between your computer and your untrusted USB device, isolating the badness and keeping your computer safe. Hit [the Wiki](https://github.com/robertfisk/USG/wiki) for more info!
This is the firmware branch for the USG v0.9, which is the DIY hardware assembled out of development boards. Learn how to [build your own USG here.](https://github.com/robertfisk/USG/wiki/Hardware-%28DIY-v0.9%29)
