I don't see it in https://archive.org/details/worksofsirthomas0000urqu https://archive.org/details/worksofsirthomas0000urqu or https://archive.org/details/bim_e

I don't see it in https://archive.org/details/worksofsirthomas0000urqu https://archive.org/details/worksofsirthomas0000urqu or https://archive.org/details/bim_early-english-books-1641-1700_logopandecteision-or-an_urquhart-sir-thomas_1653 https://archive.org/details/bim_early-english-books-1641-170... I also don't find it on the site of "Klaus Schmeh" that it claims to be on a list of "Top 50 unsolved encrypted messages": https://klausschmeh.net/?s=Cyphral https://klausschmeh.net/?s=Cyphral Looks like the best source I can find is this: https://scienceblogs.de/klausis-krypto-kolumne/2014/11/17/wer-knackt-dieses-verschluesselte-distichon/ https://scienceblogs.de/klausis-krypto-kolumne/2014/11/17/we... which seems real-ish?