There is Horcrux https://github.com/jesseduffield/horcrux https://github.com/jesseduffield/horcrux. One of the projects I've personally had in the back of my he

There is Horcrux https://github.com/jesseduffield/horcrux https://github.com/jesseduffield/horcrux. One of the projects I've personally had in the back of my head is a completely self contained key system using just a self contained HTML file (so each shard is a static HTML file that can be run to read the other keys using file drag/drop).