On Fri, 27 Sep 2019 10:19:32 +0200
Didier Kryn <kryn@???> wrote:

>     Imagine a computer with no user, just root, and an empty /home
> directory. You plug in your USB disk and, automatically, your disk is
> mounted under /home /and you become a user of this laptop/ - no need
> to have root priviledge and enter your name and password in the
> database. There's nothing precious on the computer, except the
> contents of /your/ disk.

Err, Apart from the hardware based X-factor authentication, this is
nothing new as it existed under *nix and Novell and predates Linux by
a few years. The concept later re-appeared as diskless workstations, or
some such, at one stage when HW costs were high and networks would choke
easily.