Major code breaks in history What are the major code breaks in the history of cryptography? Which code breaks changed the face of a battle or another major event? Which one had nationwide consequences?
Besides the ones mentioned in the already existing Q&amp;A "Examples of modern, widely used ciphers that suddenly fell?", the following major code breaks have been notable in history:


The break of the German Enigma based codes in the second world war by the team led by Alan Turing;
Project Magic / Purple;
Crypto AG's Hagelin C(X)-52, which can be regarded as a break from an operational standpoint;
The Zimmermann Telegram;
Break of Lorenz cipher;
Halske T52;
Project Venona;
Break of JN-25.