Hugh Rose Foss (13 May 1902 – 23 December 1971) was a British cryptographer.
In December 1924 he joined the Government Code and Cipher School in 1924. He recalled learning of two models of the Enigma machine in 1926: the large non-reciprocal typing B model, and the small index C model. In 1927 Edward Travis gave him a small (reciprocal) machine to examine, and he wrote a paper, "The Reciprocal Enigma", on solving the non-plugboard Enigma. The small [C Model] Enigma was developed by the German services; the standard World War II British Typex machine was also developed from it. In September 1934 Foss and Oliver Strachey broke the Japanese naval attaché cipher. 8 May 1940, he broke German enigma code, this day is referred to as "Foss's Day"[by whom?] in honour of this feat.
At Bletchley Park in World War II, Foss headed the Japanese Naval Section (Hut 7) from 1942 to 1943. In December 1944 he went to Washington and worked with U.S. Navy cryptographers on Japanese ciphers. A sandal-wearer, he was known as "Lend-lease Jesus". Gordon Welchman was told that Foss was highly esteemed by the Americans, and says that "before the war he was one of the most brilliant of the professional cryptographers of the Government Code and Cypher School".
Foss' paper "Reminiscences on Enigma", written in 1949, is included as chapter 3 in Action this Day.
He retired from GCHQ in 1953 and died in St. John's Town of Dalry, Scotland, in 1971.
Notes and references
- Erskine & Smith 2011, p. 35
- Dictionary of National Biography
- Erskine, Ralph; Smith, Michael, eds. (2011), The Bletchley Park Codebreakers, Biteback Publishing Ltd, ISBN 978-1-84954-078-0 Updated and extended version of Action This Day: From Breaking of the Enigma Code to the Birth of the Modern Computer Bantam Press 2001
- Welchman, Gordon (1997) , The Hut Six story: Breaking the Enigma codes, Cleobury Mortimer, England: M&M Baldwin, ISBN 978-0-947712-34-1 New edition updated with an addendum consisting of a 1986 paper written by Welchman that corrects his misapprehensions in the 1982 edition.
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