# Cubo Libre USB

## Hardware Firewall

See:

* https://code.forksand.com/forksand/usb-firewall

* Provide mechanical port blockers for unused ports.

* Device only pass certain USB IDs, HID, etc.

## Authentication

* Nitrokey
https://www.nitrokey.com/

* Yubi.

* Purism key.

* Ledger.