https://groups.google.com/g/alt.privacy.anon-server/c/IrBgFHsLu0w https://github.com/sac001/ms
Length 8 truly random chars from range [a-z0-9] yields 108 bit, 9 yields 114, 10 yields 119, 11 yields 124, 12 beats AES at 129. One's ability to remember decreases rapidly with the length X range of random things involved, these large multiples are easily forgotten, same with randomly generated stories, random strings, etc. Whitepapers that you can find and post may discuss the memory sweet spot tradeoff between length and range. Length is difficult. The world is full of books and other reliably duplicated distributed and stored media. book xor page xor brainphrase ~= only 3 elements, yet can yield quite a bit more retrievable memorable and portable entropy than expected, to which user can also add in elements such as markov window, substitution / ROT-n, translation, etc... 5 to 6 elements. You may also find and post papers estimating that.