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?