Not sure what you mean. The USB stick gets mounted as read-only on boot, so while technically you could write to it, this does not happen. The key never gets wr

Not sure what you mean. The USB stick gets mounted as read-only on boot, so while technically you could write to it, this does not happen. The key never gets written to the USB stick, and is only kept in memory, sent to the wired printer as an QR code, and of course the Yubikey. I then wipe the USB just because, but there is no real point in doing so. The largest vulnerability here would be the printer having some kind of memory, since BadUSB is a myth.