Leslie Yoxall

Leslie Yoxall

Albert [Friends of Bletchley Park Newsletter, Winter 2005, p. 3] Leslie Yoxall (18 May 1914 – 30 September 2005)cite news|title=Leslie Yoxall|publisher=The Times|date=27 October 2005|url=http://www.timesonline.co.uk/article/0,,60-1844435,00.html|accessdate=2006-02-23] was a British codebreaker at Bletchley Park during World War II. He devised a method to assist in solving Enigma messages which was dubbed Yoxallismus. After the war he worked at GCHQ until the mid-1970s.

Early life

Yoxall was born in Salford, and was the youngest out of four brothers. His father died young in a tramway accident. Leslie Yoxall was educated at Manchester Grammar School from 1925"In Memoriam: Leslie Yoxall", Bletchley Park Newsletter, Spring 2006] and Sidney Sussex College, Cambridge from 1933, graduating with first-class honours. He received his doctorate in 1941.

On the outbreak of war, Yoxall returned to teach at Manchester Grammar School, and was next in line to become the head of mathematicsHugh Sebag-Montefiore, "Enigma: The Battle for the Code", 2000, ISBN 0-7538-1130-8, p. 296] .

Codebreaking at Bletchley Park

In April 1941, Gordon Welchman wrote to Yoxall advising him that he would soon be asked to help with "war work". In due course, Yoxall was invited to join Bletchley Park and was, alongside Bill Tutte, interviewed by Hugh Alexander and then Alan Turing. Yoxall was selected to join the team in Hut 8, working on Naval Enigma as a "temporary junior administrative officer". He worked on the problem of "Offizier" (Officer) messages, which had been enciphered on Enigma with a second setting for additional security. Yoxall discovered what became known as "Yoxallismus", a method for recovering the Offizier setting.

In October/November 1942 [Ralph Erskine, "Breaking German Naval Enigma" in "Action this Day", edited by Ralph Erskine and Michael Smith, 2001, ISBN 0-593-04982-9, p. 186] , he moved to Hut 7 to work on a Japanese naval cipher, making a significant contribution in identifying how the cipher permutations were constructed.

Post-war work

After the war he moved to Eastcote and then moved again with GCHQ to Cheltenham in 1953. He worked in Washington as a liaison officer from 1959 to 1963, and returned again in 1968 to 1972. After the first tour in the US, a letter sent to the director of GCHQ (Clive Loehnis) stated that "his superior technical competence and analytic insight have served as a stimulus to everyone with whom he came into contact. His engaging personality, diplomacy and tact have endeared him to us all".

He retired from GCHQ around 1974 and returned to teaching, tutoring and coaching students in mathematics.

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Leslie Yoxall — Albert Leslie Yoxall (* 18. Mai 1914 in Salford; † 30. September 2005)[1] war ein englischer Kryptoanalytiker. Während des Zweiten Weltkrieges trug er in der Government Code and Cypher School (GC CS) (deutsch etwa: „Staatliche Code und… …   Deutsch Wikipedia

  • List of people associated with Bletchley Park — This is a list of people associated with Bletchley Park (the British codebreaking establishment), notable either for their achievements there or elsewhere.Work at or for Bletchley Park is given first, followed by achievements elsewhere in… …   Wikipedia

  • Hut 8 — was a section at Bletchley Park (the British World War II codebreaking station) tasked with solving German naval Enigma messages. The section was led initially by Alan Turing. He was succeeded by his deputy Conel Hugh O Donel Alexander in… …   Wikipedia

  • Hut 7 — was a wartime section of the Government Code and Cypher School in Bletchley Park tasked with the solution of Japanese naval codes such as JN4, JN11, JN40, and JN25 [cite book |last=Loewe |first=Michael |chapter=Chapter 26: Japanese Naval Codes… …   Wikipedia

  • Alan Turing — Statue von Turing an der University of Surrey …   Deutsch Wikipedia

  • Alastair Denniston — Alexander Guthrie „Alastair“ Denniston (* 1. Dezember 1881; † 1. Januar 1961) war ein britischer Kryptoanalytiker (engl.: codebreaker), der während des Ersten Weltkriegs im Room 40 (deutsch: „Zimmer 40“) arbeitete und zu Beginn des… …   Deutsch Wikipedia

  • Bletchley Park — Das Herrenhaus (engl.: The mansion) von Bletchley Park (2002) war die Zentrale der britischen Codeknacker und ist heute ein Museum Bletchley Park (Abkürzung: BP) ist der Name eines Landsitzes in der englischen Stadt Bletchley im Bezirk (engl.:… …   Deutsch Wikipedia

  • Conel Hugh O’Donel Alexander — (* 19. April 1909 in Cork; † 15. Februar 1974 in London) war ein britischer Schachmeister. Während des Zweiten Weltkrieges trug er wesentlich zur Entzifferung der deutschen Rotor Schlüsselmaschine ENIGMA bei. Inhaltsverzeichnis 1 Leben 2 Schach …   Deutsch Wikipedia

  • D. R. Shackleton Bailey — David Roy Shackleton Bailey (* 10. Dezember 1917 in Lancaster; † 28. November 2005 in Ann Arbor) war ein britischer Latinist. Nach dem Besuch der Lancaster Royal Grammar School, deren Rektor sein Vater war, studierte „Shack“, wie er von seinen… …   Deutsch Wikipedia

  • Dillwyn Knox — Alfred Dillwyn „Dilly“ Knox (* 23. Juli 1884; † 27. Februar 1943) war einer der ersten britischen Codeknacker in der zentralen militärischen Dienststelle Bletchley Park, in der während des Zweiten Weltkriegs die von den Deutschen mit der Enigma… …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”