Hi. Its a nice and very simple web site you have created. May I ask why you are using Shamir’s Secret Sharing, would it not be possible to use very simple Substitution Cipher? Maybe I am missing something when it comes to Substitution Cipher. I just see many implementations of SSS so I was wondering why people find SSS preferable over using something more simple like Substitution Cipher? One benefit of Substitution Cipher imo is that you can somewhat easily recover secrets with pen and paper also if needed.