What a coincidence, 3 days ago I ordered two pieces of yubikey 5, today arrived a package and today I read a post on how to use them in an interesting way for emergency access to my server via SSH.

I'd like to add that the way it's described really works.

But... Now I don't know to leave one yubikey in case I need to use it for emergency access to ssh? I have a server since 2011 and I have never problems with access through ssh, I use the same keys to this day and everything works.

I think this way with yubikey to emergency access is overkill.

It's just an interesting way to use yubikey.