Initially, he was not accepted for military service, but after his third attempt, he was accepted to work as a translator and cryptographer at the Bletchley Park facility. His first attempt to work as a codebreaker was turned down because of his German birth and upbringing, but it seems that the security eligibility rules were revised in May 1941 thereby enabling him to enlist.
Government Code and Cypher School, Bletchley Park After being interviewed by
C. P. Snow and
Hugh Alexander, Noskwith was recruited to
Bletchley Park and arrived in June 1941. He worked in
Hut 8, focusing on the German navy's
Enigma machine, decrypting the
Kriegsmarine's coded wireless traffic from 1941 to 1945, and subsequently on other ciphers. He joined the
crib subsection, headed by
Shaun Wylie. One of Noskwith's noted talents was lining up cribs with cipher text strips, to see if they matched. Noskwith's biggest accomplishment was breaking the Naval Enigma
Offizier settings. He created a
crib based on the letters 'EEESSSPATRONE' and had placed into queue to be crunched by Bletchley's
bombe analogue computers. The letter pairings referred to colour-coding used by German ships' flares as "
friend or foe" detection. When the crib worked, it allowed the
Allied forces to read German messages sent to and from
Kriegsmarine officers. Noskwith recalled that most people were addressed by their first name there: the two exceptions were Alan Turing, known as "Prof"; and F.A. Kendrick, whom he was surprised to see listed in the index of Hinsley and Stripp's book
Codebreakers as Kendrick, Tony. ==Later life and death==