Adding to this thread since it seems to be more about Shamir’s Secret Sharing than the other one is:
In addition to what I wrote there, I’d like to drop a few more links.
An explainer for how SSS works by walking through how to implement it: Horcrux: Implementing Shamir's Secret Sharing in Rust (part 1) | Blog | Guillaume Endignoux
This library is for doing SSS on any file. Specifically the use case seems to be splitting up the “horcruxes” and putting them on USB drives and hiding those around in various places: GitHub - jesseduffield/horcrux: Split your file into encrypted fragments so that you don't need to remember a passcode