Well - I have been studying this week to understand how this cypher “works”. And as I was working it out … something was vaguely familiar. So found my “Secret Writing” book and YES! YES! The Trithemius Cypher😊. I will enjoy my weekend!! Thank for great fun and learning.
Now *this* is a 5-star puzzle! Having knowledge of poker hands is a must. Even once the connection between "Le Chiffre" and the Vigenere cipher is discovered the puzzle remains a joy to decipher and you (probably) get to learn something new.
This one's my favourite entry in the new book... so far.