I personally haven’t dug that deep into how to protect the information, purely because the information for myself wasn’t too sensitive… I liked that the files are created in markdown and saved on your own system from a privacy standpoint because I was think they were more privacy with me, locally, rather than someone else’s server.

I’ve just had a look at the plugins now and there’s one called Meld Encrypt which has over 36,000 downloads, this seems to allow you to create encrypted notes.