Arthur Scherbius patents the first Enigma machine, originally designed for commercial use.
The first commercial Enigma machine is produced by Scherbius & Ritter.
Polish mathematicians Marian Rejewski, Jerzy Różycki, and Henryk Zygalski begin breaking Enigma codes.
Marian Rejewski, Jerzy Różycki, and Henryk Zygalski revolutionize cryptanalysis with mathematical theory.
The complex mechanical design of the Enigma machine is fully understood and documented.
The British Government Code and Cypher School moves to Bletchley Park.
Alan Turing and Gordon Welchman develop the Bombe machine to break Enigma codes.
The British successfully break the Naval Enigma code, a major breakthrough in the war.
A decisive naval victory made possible by breaking Italian naval codes at Bletchley Park.
The war ends, and the work at Bletchley Park remains classified for decades.