Ultra (cryptography) (English Wikipedia)

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cix.co.uk

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cryptomuseum.com

see: Crypto AG: Hagelin cipher machines

doi.org

Haigh, Thomas (January 2017). "Colossal Genius: Tutte, Flowers, and a Bad Imitation of Turing". Communications of the ACM. 60 (1): 29–35. doi:10.1145/3018994. S2CID 41650745.
Deutsch 1977, p. 16. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Deutsch 1977, pp. 16–17. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Deutsch 1977, p. 17. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Deutsch 1977, p. 28. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Deutsch 1977, p. 1. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.

earthlink.net

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Momsen 2007. Momsen, Bill (2007) [1977], Codebreaking and Secret Weapons in World War II: Chapter IV 1941–42, Nautical Brass, archived from the original on 26 January 2001, retrieved 18 February 2008

jewishgen.org

"Poland and her Jews 1941 - 1944". www.jewishgen.org.

jewishvirtuallibrary.org

Hanyok 2004, p. 126 Hanyok, Robert J. (2004), Eavesdropping on Hell: Historical Guide to Western Communications Intelligence and the Holocaust, 1939–1945 (PDF), Center for Cryptographic History, National Security Agency
Hanyok 2004, p. 124 Hanyok, Robert J. (2004), Eavesdropping on Hell: Historical Guide to Western Communications Intelligence and the Holocaust, 1939–1945 (PDF), Center for Cryptographic History, National Security Agency

latimes.com

Piekalkiewicz, Janusz (9 August 1987). "Operation 'Citadel'—Kursk and Orel: The Greatest Tank Battle of the Second World War by Janusz Piekalkiewicz; translated by Michaela Nierhaus; (Presidio: $25; 288 pp., illustrated)". Los Angeles Times (book review). Retrieved 8 June 2016.

loc.gov

thomas.loc.gov

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nsa.gov

Farley 1980, p. 39. Farley, R. D. (25 November 1980), Oral History Interview NSA-OH-40-80 with Arthur J. Levenson (PDF), retrieved 24 September 2016
Farley 1980, p. 40. Farley, R. D. (25 November 1980), Oral History Interview NSA-OH-40-80 with Arthur J. Levenson (PDF), retrieved 24 September 2016
Sharing the Burden—Women in Cryptology During World War II, Jennifer Wilcox, Center for Cryptologic History, 1998
Deutsch 1977, p. 16. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Deutsch 1977, pp. 16–17. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Deutsch 1977, p. 17. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Deutsch 1977, p. 28. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Deutsch 1977, p. 1. Deutsch, Harold C (1977). "The Historical Impact of Revealing the Ultra Secret" (PDF). The US Army War College Quarterly: Parameters. 7 (1). U.S. Army War College: 16–32. doi:10.55540/0031-1723.1102.
Miller, A. Ray (2001). The Cryptographic Mathematics of Enigma (PDF). National Security Agency. Archived from the original (PDF) on 17 January 2009. Retrieved 14 January 2015.

semanticscholar.org

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Haigh, Thomas (January 2017). "Colossal Genius: Tutte, Flowers, and a Bad Imitation of Turing". Communications of the ACM. 60 (1): 29–35. doi:10.1145/3018994. S2CID 41650745.

theguardian.com

Cox, David (28 November 2014). "The Imitation Game: how Alan Turing played dumb to fool US intelligence - David Cox". The Guardian.

washingtonpost.com

(Brzezinski 2005, p. 18) Brzezinski, Matthew (24 July 2005). "Giving Hitler Hell". Washington Post. Retrieved 16 March 2016.

web.archive.org

"Bletchley Park Archives: Government Code & Cypher School Card Indices". Archived from the original on 29 April 2011. Retrieved 8 July 2010.
"Seventy Years Ago This Month at Bletchley Park: December 1940". Bletchley Park National Codes Centre. Archived from the original on 29 April 2011. Retrieved 16 December 2010.
Bletchley park archives: October 1943 : Not all our own way, archived from the original on 2 April 2013, retrieved 9 February 2011
Momsen 2007. Momsen, Bill (2007) [1977], Codebreaking and Secret Weapons in World War II: Chapter IV 1941–42, Nautical Brass, archived from the original on 26 January 2001, retrieved 18 February 2008
Withers-Green, Sheila (2010), audiopause audio: I made a promise that I wouldn't say anything, archived from the original on 8 October 2011, retrieved 15 July 2011
"Nazi War Crimes and Japanese Imperial Government Disclosure Act of 2000". Archived from the original on 3 February 2016. Retrieved 8 September 2015.
"Bletchley Park Welcomes 2015'S 200,000th Visitor". Bletchley Park. 26 August 2015. Archived from the original on 2 February 2017. Retrieved 25 January 2017.
Miller, A. Ray (2001). The Cryptographic Mathematics of Enigma (PDF). National Security Agency. Archived from the original (PDF) on 17 January 2009. Retrieved 14 January 2015.

worldcat.org

search.worldcat.org

Pidgeon 2003. Pidgeon, Geoffrey (2003), The Secret Wireless War: The Story of MI6 Communications 1939–1945, St Leonards-on-Sea, East Sussex: UPSO Ltd, ISBN 1-84375-252-2, OCLC 56715513
Mallmann-Showell 2003. Mallmann-Showell, J.P. (2003), German Naval Code Breakers, Hersham, Surrey: Ian Allan Publishing, ISBN 0-7110-2888-5, OCLC 181448256