Tent, James Foster.
E-Boat Alert: Defending the Normandy Invasion Fleet. Annapolis, MD:
Naval Institute Press, 1996. Tent, James Foster.
E-Boat Alert: Defending the Normandy Invasion Fleet. Annapolis, MD:
Naval Institute Press, 1996.
Foot, I&NS 12.2, sees this work as making a strong case for the tactical value of Ultra. Although initial surprise was achieved in the Normandy invasion, the German E-Boats remained a substantial threat to follow-on activities. Communications intelligence, confirmed by aerial photo-reconnaissance, pin-pointed the concentration of E-Boats at Le Havre. A daylight raid on 14 June 1944 by RAF Bomber Command essentially ended the threat. Tent has welded "diverse sources together into a readable and convincing narrative."
Teuscher, Christof, ed. Alan Turing: Life anf Legacy of a Great Thinker. New York: Springer-Verlag, 2004.
According to Kruh, Cryptologia 29.1 (Jan. 2005), this collection of 21 essays comes out of a 2002 conference pegged to what would have been Turing's 90th birthday. "[T]he distinguished contributors have expertise in such diverse fields as artificial intelligence, natural computing, mathematics, physics, cryptography, cognitive studies, philosophy, and anthropology."
Thomas, Edward E. "A
Sidelong Glance at Alan Turing." In In the Name of Intelligence:
Essays in Honor of Walter Pforzheimer, eds. Hayden B. Peake and Samuel
Halpern, 461-469. Washington, DC: NIBC Press, 1994.
Ulbricht, Heinz. "Uncle Dick and other Horrors of the Enigma." Journal of Intelligence History 1, no. 1 (Summer 2001). [http://www.intelligence-history.org/jih/previous.html]
From abstract: "Bletchley Park was quite effective in solving the German keys [of the Enigma cipher machine] until in January 1944 some messages resisted the usual treatment. This was due to an additional reflector, 'Dora', which was soon nicknamed 'Uncle Dick'.... Fortunately, different key nets used either one or the other reflector and even committed the sin of re-enciphering messages.... Another new contraption designed to improve the security of the Enigma in 1944 was the 'Enigma-Uhr.' It was the only alteration by the Germans ... that had been introduced without any warning.... In the worst case, a message had been encoded with both 'Dora' and the 'Uhr.' These and other measures confirm that the Enigma, if handled properly, was indeed unbreakable by any known method."
van
der Meulen, Michael. "German WW II Documents on Cryptography and Cryptanalysis."
International Intelligence History Study Group Newsletter 6, no.
1 (Summer 1998). [http:// intelligence-history.wiso.uni-erlangen.de/]
"At the end of April 1998, the FOIA Office of the NSA submitted a list of translated German World War II documents related to cryptography and cryptanalysis.... Footnote 1 of the document DF 210 ... reveals the origin of the 'DF'-series as a collection of miscellaneous translations of German documents which were received by the early TICOM section of the Signal Security Agency and kept within a special folder for documents related to TICOM material... The introduction to the listing further states that early translations made at Army Security Agency ... were not numbered but sent to GCHQ, England w[h]ere they were issued in the TICOM/D series."
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