Dilly Knox

Source: Wikipedia, the free encyclopedia.

Alfred Dillwyn "Dilly" Knox

CMG
Born
Alfred Dillwyn Knox

(1884-07-23)23 July 1884
Headington, Oxford
Died27 February 1943(1943-02-27) (aged 58)
Wycombe, Buckinghamshire
Other namesDilly
CitizenshipBritish
Alma materKing's College, Cambridge
Occupations
Employers
Title
Spouse
Olive Rodman
​
(m. 1920)​
Children2
Parent
Edmund Arbuthnott Knox
Relatives

Alfred Dillwyn "Dilly" Knox,

Government Code and Cypher School (GC&CS).[2]

As Chief Cryptographer,

Second World War which disclosed Polish cryptanalysis of the Axis Enigma to the Allies.[3]

At

D-Day.[5]

Personal life and family

Dillwyn Knox, the fourth of six children,

Merton College and later Bishop of Manchester; he was the brother of E. V. Knox, Wilfred Knox, Ronald Knox,[6] Ethel Knox, and Winifred Peck,[7] and uncle of the novelist Penelope Fitzgerald.[8] His father was a descendant of John Arbuthnott, 8th Viscount of Arbuthnott.[9][10][11][12]

Dillwyn—known as "Dilly"—Knox was educated at

undergraduate he was friends with Lytton Strachey and John Maynard Keynes. He and Keynes were lovers at Eton.[14] Knox privately coached Harold Macmillan, the future Prime Minister at King's for a few weeks in 1910, but Macmillan found him "austere and uncongenial".[13]

He married Olive Rodman in 1920, forgetting to invite two of his three brothers to his wedding.[15] The couple had two sons, Oliver and Christopher.[citation needed]

He was an

atheist.[a]

Academic scholarship

Between the two World Wars Knox worked on the great commentary on Herodas that had been started by Walter Headlam, damaging his eyesight while studying the British Museum's collection of papyrus fragments, but finally managing to decipher the text of the Herodas papyri. The Knox-Headlam edition of Herodas finally appeared in 1922.[16]

Codebreaking

First World War

The sailor in Room 53
has never, it's true, been to sea
but though not in a boat
he has served afloat —
in a bath in the Admiralty.

— Alice in ID25 by
Frank Birch[17]

Soon after war broke out in 1914,

ID25.[2]

Among other tasks, he was involved in breaking:

  • the Zimmermann Telegram, which contributed to bringing the USA into the war.[1]
  • much of the German admiral's flag code by exploiting an operator's love of romantic poetry.[2]

Between the wars

Government Code and Cypher School

Oh, if a time should ever come when we're demobilized How we shall miss the interests which once life comprised!

— Dilly the Dodo
Frank Birch

During the First World War he had been elected Librarian at King's College, but never took up the appointment. After the war Knox intended to resume his research at King's, but was persuaded by his wife to remain at his secret work; indeed, so secret was this work that his own children had no idea, until many years after his death, what he did for a living, and his contribution to the war effort.[13]

Commercial Enigma

The Enigma machine became available commercially in the 1920s. In Vienna in 1925,[20] Knox bought the Enigma 'C' machine evaluated by Hugh Foss in 1927 on behalf of GC&CS. Foss found "a high degree of security" but wrote a secret paper describing how to attack the machine if cribs — short sections of plain text — could be guessed.[3] When — a decade later — Knox picked up this work, he developed a more effective algebraic system (rodding) based on the principles described by Foss.[20]

Spanish Enigma

The Germany Navy (Kriegsmarine) adopted Enigma in 1926, adding a plug-board (stecker) to improve security. Nazi Germany supplied non-steckered machines to Franco's Nationalists in the Spanish Civil War. On 24 April 1937, Knox broke the Spanish Enigma but knowledge of this breakthrough was not shared with the Republicans.[3][b] Soon afterwards, Knox began to attack signals between Spain and Germany encrypted using steckered Enigma machines.[3]

On the eve of the Second World War

Polish–French–British meetings

GC&CS began to discuss Enigma with the

Biuro Szyfrów (Polish cryptographers).[3] Knox, Hugh Foss and Alastair Denniston represented the GC&CS at the first Polish–French–British meeting at Paris in January 1939.[2] The Poles were under order to disclose nothing of importance, leaving the British codebreakers disappointed. Knox's description of his system of rodding impressed the Polish codebreakers and they requested his presence at a second meeting.[3]

Knox grasped everything very quickly, almost quick as lightning. It was evident that the British had been really working on Enigma ... So they didn't require explanations. They were specialists of a different kind, of a different class.

— Marian Rejewski[2]

Knox attended the second

decryption.[21]

Although

cryptographer and mathematician who solved the plugboard-equipped Enigma used by Nazi Germany, approached the problem through permutation theory (whereas Knox applied linguistics), a good personal relationship was quickly established at the conference. The good impression made by Rejewski on Knox played an important role in increasing recruitment of mathematicians to Bletchley Park.[2] Knox was chagrined — but grateful — to learn how simple was the solution of the Enigma's entry ring (standard alphabetical order).[21]

It was such an obvious thing to do, really a silly thing to do, that nobody, not Dilly Knox or Tony Kendrick or Alan Turing, ever thought it worthwhile trying it.

— Peter Twinn[3]

After the meeting, he sent the Polish cryptologists a very gracious note in Polish, on official British government stationery, thanking them for their assistance and sending "sincere thanks for your cooperation and patience".[2] Enclosed were a beautiful scarf featuring a picture of a Derby winner and a set of paper 'batons'.[21]

I don't know how Knox's method was supposed to work, most likely he had hoped to vanquish Enigma with the batons. Unfortunately we beat him to it.

— Marian Rejewski[2]

These 'batons' were known as rods to the British and had been used to solve the Spanish Enigma. Knox's rodding method was later used to break the Italian Naval Enigma.[2]

Turing's bombe

1939 register Turing was recorded in Naphill
, staying with Knox and his wife. By November 1939 Turing had completed the design of the bombe — a radical improvement of the Polish bomba.[22]

Second World War

Knox's rodding method

To break non-steckered Enigma machines (those without a plugboard), Knox (building on earlier research by Hugh Foss) developed a system known as 'rodding', a linguistic as opposed to mathematical way of breaking codes.[3] This technique worked on the Enigma used by the Regia Marina (Italian Navy) and the German Abwehr.[23] Knox worked in 'the Cottage', next door to the Bletchley Park mansion, as head of a research section, which contributed significantly to cryptanalysis of the Enigma.[6]

Knox's team at The Cottage used rodding to decrypt intercepted Italian naval signals describing the sailing of an Italian battle fleet, leading to the

Allied victory at Matapan to this intelligence; Admiral Sir Andrew Cunningham, who had commanded the victorious fleet at Matapan, went to Bletchley to congratulate 'Dilly and his girls'.[2]

Intelligence Services Knox

In October 1941, Knox solved the Abwehr Enigma.

D-Day.[5]

Death

Knox's work was cut short when he fell ill with lymphoma.[24] When he became unable to travel to Bletchley Park, he continued his cryptographic work from his home in Hughenden, Buckinghamshire, where he received the CMG.[25] He died on 27 February 1943.[25] A biography of Knox, written by Mavis Batey, one of 'Dilly's girls', the female codebreakers who worked with him, was published in September 2009.[26]

Classified poetry

These have knelled your fall and ruin, but your ears were far away
English lassies rustling papers through the sodden Bletchley day.

— Dilly Knox, Epitaph on Matapan to Mussolini[2]

Knox celebrated the victory at Battle of Cape Matapan with poetry, which remained classified until 1978.[2]

References

Notes

  1. ^ "Dillwyn [Knox, son of an Evangelical bishop] was from his student years an unwavering atheist." Alan Hollinghurst, "The Victory of Penelope Fitzgerald" (a review of Hermione Lee, Penelope Fitzgerald [a niece of Alfred Dillwyn Knox]: A Life, Knopf, 488 pp.), The New York Review of Books, vol. LXI, no. 19 (4 December 2014), p. 8. (The article comprises pp. 8, 10, 12.)
  2. ^ Keeley 2008 States "Professor Denis Smyth, of the University of Toronto, an expert on Second World War intelligence operations, said that the British codebreaker Alfred Dilwyn Knox cracked the code of Franco's machine in 1937, but 'this information was not passed on to the Republicans.'"

Citations

  1. ^ a b Gannon 2011
  2. ^ a b c d e f g h i j k l m n o Batey 2011
  3. ^ a b c d e f g h Smith 2010
  4. ^ a b c d e f Batey 2009, p. xi
  5. ^ a b c Staff writer 2004
  6. ^ a b c d e Batey 2004
  7. ^ "Peck, Winifred Frances, (Lady Peck)", Who Was Who, online edition, Oxford University Press, 2014, retrieved 9 May 2014 (subscription required)
  8. ^ Fitzgerald 2002
  9. ^ Dod's Peerage, Baronetage and Knightage of Great Britain and Ireland, Sampson Low, Marston & Co., 1904, p. 983
  10. ^ The Spectator, vol. 20, 1847, p. 1171
  11. ^ The Gentleman's Magazine, vol. 177, 1845, p. 311
  12. ^ Bt, Sir William Arbuthnot. "Table E part 2". www.kittybrewster.com. Archived from the original on 15 June 2006.{{cite web}}: CS1 maint: unfit URL (link)
  13. ^ a b c "Richmond, John Classics and Intelligence - 'Classics Ireland' Volume 9 (2002)". Archived from the original on 30 March 2022. Retrieved 22 June 2012.
  14. ^ Thorpe 2010, p. 27
  15. ^ Batey 2009, p. xii
  16. ISBN 978-1290531078
  17. ^ a b Andrew 2011
  18. ^ Goebel
  19. ISBN 9781849542623
    . Retrieved 26 October 2022.
  20. ^ a b Foss 2011
  21. ^ a b c Budiansky 2000, pp. 95–96
  22. ^ Copeland 2011, p. 313
  23. ^ Carter, p. 1
  24. ^ Sebag-Montefiore 2000, p. 350
  25. ^ a b Fitzgerald 2002, pp. 249–250
  26. ^ Batey 2009

Works cited

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Dilly_Knox&oldid=1217955268"