Imagine… Last night, lightning struck our house and burned it down. I escaped wearing only my nightclothes. In an instant, everything was vaporised. Laptop? Cinders. Phone? Ashes. Home server? A smouldering wreck. Yubikey? A charred chunk of gristle. This presents something of a problem. In order to recover my digital life, I need to be able to log in to things. This means I need to know my usernames (easy) and my passwords (hard). All my passwords are stored in a Password Manager. I can r…