German submarine U-110 was a Type IXB U-boat of Nazi Germany's Kriegsmarine that operated during World War II. She was captured by the Royal Navy on 9 May 1941 and provided a number of secret cipher d
U-110 and HMS Bulldog
Reservehandverfahren
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Reservehandverfahren was a German Naval World War II hand-cipher system used as a backup method when no working Enigma machine was available.
German submarine U-110 (1940)
…was intentionally sunk en route to prevent its capture from being revealed. The documents captured from U-110 helped Bletchley Park codebreakers solve Reservehandverfahren, a reserve German hand cipher. U-110 took part in one wolfpack, West (9 May 1941…
Front cover of general Reservehandverfahren instruction booklet