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RE: Renzo's guide to password security - A MUST-READ!
I know it's not the most secure you can get, but even a little amount of encryption can go a long way
You can do substitution cipher (Caesar cipher) like the one @renzoarg mentioned here
www.rot13.com
Rot(number n) just replaces letters with the letter that is n distance from it. This particular website doesn't seem to work for numbers, but once you get an idea, you can program one yourself with similar or any custom algorithm you can come up with and run it on the ASCII values of characters, it will work flawlessly for any character you may type on your keyboard
Yes, I only placed caesar's as a simple example, there's several "old school" cyphers that can be used as extra "layers", all the owner needs to know, is in which order he used them (I'd be VERY BAD to forget that! but a memory aid can be added as a "sidenote" in the paper, with another, simpler code).
My personal favorite is the ADfGVX, I wrote about it a long time ago here: The most famous Field Cipher: ADfGVX - And its important Role during WWI - Steemit