1.     Wikipedia Definition of Cryptanalysis: https://en.wikipedia.org/wiki/Cryptanalysis

2. Wikipedia Article about Elizebeth Smith Friedman: https://en.wikipedia.org/wiki/Elizebeth_Smith_Friedman

3.  American Experience – Learn More about the World of Elizebeth Smith Friedman: https://www.pbs.org/wgbh/americanexperience/features/codebreaker-learn-more-elizebeth-smith-friedman/ 

4. Women of Bletchley Park

• • Bletchley Park “girls” break code of secrecy for book launch: http://www.theguardian.com/uk-news/2015/jan/20/bletchley-park-women-meet-codebreakers-book-launch

• • Bletchley Park Research, Women Codebreakers: http://www.bletchleyparkresearch.co.uk/research-notes/women-codebreakers/

• • Extraordinary Female Codebreakers of Bletchley Park: http://www.telegraph.co.uk/history/world-war-two/11308744/The-extraordinary-female-codebreakers-of-Bletchley-Park.html

• • What Happened to the Women of Bletchley Park: http://www.telegraph.co.uk/culture/tvandradio/9520807/What-happened-to-the-women-of-Bletchley-Park.html

• • Women of Bletchley Park: http://www.mkheritage.co.uk/bpt/Women/wrensOS.html

• • Women of Bletchley Park, 1938-1945, Google Cultural Institute: https://www.google.com/culturalinstitute/exhibit/the-women-of-bletchley-park/QQZ2YSRa?hl=en&position=39%2C35

• • Women of Bletchley Park Tell Their Story: http://www.scotsman.com/lifestyle/heritage/the-women-of-bletchley-park-tell-their-story-1-3650112.

• • Women Were Key to WWII Code-Breaking at Bletchley Park: http://www.smithsonianmag.com/smart-news/women-were-key-code-breaking-bletchley-park-180954044/?no-ist

4. Bletchley Park

• Bletchley Park: https://en.wikipedia.org/wiki/Bletchley_Park
• Britannica article: https://www.britannica.com/place/Bletchley-Park
• Hidden Figures Behind Bletchley Park’s Code-Breaking Colossus: https://spectrum.ieee.org/tech-history/dawn-of-electronics/the-hidden-figures-behind-bletchley-parks-codebreaking-colossus
• Alan Turing Wikipedia Biography: https://en.wikipedia.org/wiki/Alan_Turing

5. Enigma Ciphering System

• Wikipedia article, “Cryptanalysis of the Enigma” https://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma
• BBC – Breaking Germany’s Enigma Code: http://www.bbc.co.uk/history/worldwars/wwtwo/enigma_01.shtml
• Real Story of How Enigma Was Broken, National Museum of Computing: https://www.youtube.com/watch?v=qn_BBQEjCxI

6. “Bombe” Deciphering System

• Wikipedia article, “Bombe”: https://en.wikipedia.org/wiki/Bombe

7. Lorenz cipher machine

• Wikipedia article, “Lorenz Cipher” : https://en.wikipedia.org/wiki/Lorenz_cipher

8. Crypto Museum

• The Crypto Museum, located in Eindhoven, The Netherlands can be found at:

https://www.cryptomuseum.com/spy/mcr1/index.htm

Its page on WWII spy radio sets is at https://www.cryptomuseum.com/spy/ww2.htm.

9. The Officer and the Code Breaker

• “The Officer and the Code Breaker”: https://aamb.us/the-officer-and-the-code-breaker/

10. The Codebreaker (documentary):  AMERICAN EXPERIENCE | PBS – https://www.youtube.com/watch?v=JiQz58Y67To