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The B-Dienst (German:Beobachtungsdienst, English:observation service), also called xB-Dienst, X-B-Dienst and χB-Dienst was a Department of the Navy News Service (German:Marinenachrichtendienst) (MND III) of the OKM (Kriegsmarine), which dealt with the interception and recording, decoding and analysis of the enemy, in particular British radio communications before and during World War II. B-Dienst dealt with the German Navy cryptanalysis and de-ciphering of enemy and neutral states message traffic and security control of its own key processes and machinery. :"The ultimate goal of all evaluation was recognizing the opponents goal by pro-active identification of data." 〔Heinz Bonatz, 1981 p.56〕 B-Dienst was instrumental in molding Wehrmacht forces operations during the battle of Battle of Norway and France in the spring of 1940, primarily due to the cryptanalysis successes it has achieved against earlier and less secure British Naval Cyphers. B-Dienst broke British Naval Cypher No. 3 in December 1941, which was used for all Allied North Atlantic convoy messages, providing intelligence for the Battle of the Atlantic, until the British Admiralty introduced Naval Cypher No. 5 on 10 June 1943. ==Background== The B-Dienst unit began as the German Radio Monitoring Service, or educational and news analysis service (German: Funkhorchdienst/Horchdienst) by the end of World War One, in 1918. as part of the Imperial Navy of the German Empire. As a counterpart to the B service, in the British side, was the Y-service or Y Service''. The Y was onomatopoeic for the initial syllable of the word wireless, similar to the B initial for German service. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「B-Dienst」の詳細全文を読む スポンサード リンク
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