The secret letter of Emperor Charles V - a choose-your-own-adventure decryption

1546 - The Holy Roman Emperor and King of Spain Charles V writes to his French ambassador, Jean de Saint Mauris. Make this encrypted letter speak half a millennium after it was written is the (true!) story in which you will take part. At each stage of the deciphering process we will take the route chosen by the majority of the audience. No knowledge of Drinfeld modules, S-boxes or Euclidean lattices is required, come as many as you are to answer this question: is it a shopping list or a hitherto unknown assassination plot?

This is a joint work with Camille Desenclos, Pierrick Gaudry, and Paul Zimmermann.