The B-Dienst (Beobachtungsdienst) was a German naval codebreaking organisation. During World War II, B-Dienst solved British Naval Cypher No. 3, providing intelligence for the Battle of the Atlantic, until the British Admiralty introduced Naval Cypher No. 5 on 10 June 1943. B-Dienst also solved a number of merchant codes.
See also
References
Further reading
- Jak P. Mallmann-Showell (2003). German Naval Codebreakers. Annapolis, MD: Naval Institute Press. ISBN 0-7110-2888-5.
- Winterbotham, F.W. (2000 [1974]). The ULTRA Secret. Orion Books Ltd. pp. 84–85. ISBN 0-75283-751-6.
- David Kahn (1996[1967]). The Codebreakers. Scribner. pp. 435–477. ISBN 0-684-83130-9.
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