Trusted Device (Yubikey)
Summary
Use a device like Yubikey or custum certificat to trust a device who try to authenticate.
Design proposition
The main idea is to told to LLNG a list of device who can acces to some critical website, It's not like a 2F who is linked to a user. It's more like if you want to access to this web site you have to be on a secure computer(device) and you need to authenticate yourself also if the device is authorised to the website...