References
Videos for further learning
This documentary film illustrates the breaking of the Enigma by the Poles and in parallel shows the German military advance on Poland and then on France.
This video describes the process of breaking the Enigma done at Bletchley Park. The exhibition of the operation of a Turing Bomb Machine is a must-see.
A film with the German military operating the Enigma machine.
Gordon Welchman Contributions
Polish cryptographers were the first to crack the Enigma code
https://polandin.com/46641800/marian-rejewski-codebreaker-who-cracked-enigma
https://culture.pl/en/article/the-hacker-who-saved-thirty-million-lives
Marian Rejewski
Resurrecting Bomba Kryptologiczna: Archaeology of Algorithmic Artefacts, I
David Link
Bill Casselman, University of British Columbia
Kris Gaj and Arkadiusz Orlowski
Samantha Briasco-Stewart, Kathryn Hendrickson, and Jeremy Wright
The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography
Simon Singh
Bletchley Park
Gordon Welchman and Traffic Analysis
George Danezis and Richard Clayton
Alan Turing
https://www.iwm.org.uk/history/how-alan-turing-cracked-the-enigma-code
BBC News
How Alan Turing Helped Win WWII And Was Thanked With Criminal Prosecution For Being Gay
David Disalvo, Forbes Magazine
Cryptanalysis of the Enigma
Frank Carter