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The B-Dienst (Beobachtungsdienst) (surveillance service) 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.

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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 0-7528-3751-6. 
  • Heinz Bonatz, 1981. "Seekrieg im Aether: Die Leistungen der Marine-Funkaufklaerung 1939-1945" (Naval Warfare in the Aether: The Performance of Naval Signal Intelligence 1939-1945), Verlag E.S. Mittler & Son GmbH, Herford, 1981, ISBN 3-8132-0120-1

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