Is there an English translation of Vigeneré's "Traicté des Chiffres"? I Googled Vigeneré's "Traicté des Chiffres": no English translations,  not even a reference to one. Perhaps someone's Google-wu is better than mine; I can't find it.

I'm slogging my way through a PDF of the 1586 edition of "Traicté Des Chiffres, ou Secretes Manieres D'escrire" by Blaise de Vigenere. The language is early Modern French and doesn't translate easily in Google Translate (the words for 'right' and 'left' back then were droict and gaulche, etc). 

I'd love to read it in English. Is an English translation available?
There is neither a „modern” French edition, nor an English translation, contemporary or modern. Time to learn some contemporary French. What's the use of attempting cryptoanalysis if you can't manage the historic version of a quite common language, in this case early modern French? Your approach works like the Traicté on its own linguistic grounds, not on yours.