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Cryptanalysis In World War II

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Thesis: The application of Cryptanalysis in World War II was imperative to both Allied intelligence efforts and success of Allied Powers during the Battle of the Atlantic.

Citation: Rielage, Dale C. 2002. "'Indirectly in Operational Signals'." Naval History16, no. 6: 31. History Reference Center, EBSCOhost (accessed November 16, 2016).

Annotation: Rielage argues that due to Ultra intelligence finally being used to allow for an offensive front in the Atlantic in regards to U-boats, much success was had. He backs up this statement citing Admiral Karl Donitz, who stated that the U-boat losses which were thirteen-percent before the use of Ultra for an offensive front in the Atlantic quickly rose to thirty to fifty percent. He also acknowledges …show more content…

However, he explains that the work done at Bletchley Park exercised the honest and true role of an intelligence center and that it provided enormous benefits to the Allied cause, including revealing the dispositions and movements of the U-boats and enabling the British to use evasive convoy routing with a little success and to gain a far better understanding of U-boat strategy and tactics, which explains the decline of merchant shipping losses in the North Atlantic. Defines cryptanalysts’ Ultra as special intelligence that was of immense help in assisting in the evasive convoy routing, and demonstrates further that without special intelligence the victory could have only been achieved later, and at a greater human and material cost. This source will be used to illustrate how the work at Bletchley Park affected the sinking of the Bismarck and the positions and movement of U-boats in the North Atlantic. The source gives a relation between the breaking of the German Naval code and the frequency at which rerouting was successful, as well as how the Last Battle of the Battleship Bismarck was influenced by cryptanalysis. Beesly argues, contrary to Harold Deutsch, that the impression given in many …show more content…

Deutsch reveals that both sides suffered failures and had successes and each had to face difficulties with cryptanalysis. He explains that the German navy’s Heimisch or Hydra, codenamed Dolphin by Bletchley Park, broken from 1942 onwards, and Triton, codenamed Shark, broken periodically and sometimes for protracted periods of time, were both harder to crack in comparison to the Enigma cipher, and therefore were only as useful as the frequency to which they were broken. I will use this source to further correlate cryptanalysis during the Battle of the Atlantic and the success the allies encountered due to this. This source gives a great explanation as to what the capture of German code accessories from the German weather ship, Muenchen, as well as the German U-110. It also explains how solving the fourth rotor problem in March of 1943 meant the end

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