The simple answer is DON'T. There are technical reasons why not, including the way Joplin is built, what it does and what it doesn't, libraries used, and more important - the little security review which Joplin has seen so far. Read up on your subject on Bruce Schneier's site, than choose an appropriate solution (search for "snakeoil", yes, I am serious !)
All is relative of course. The most important step before any decision : "develop a sense of risk management to your privacy" - here is a good guide !
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