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1. Ultra revisited, a tale of two contributors 2017

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwpV1LS8NAEF58XLyIVrE-2YN4qdE22WSTo4qPg9ZLCt7KPhERC60g_ntnNptNa4soXkLJQkrzTec93xByzMBqGpvqqKekjVhayEiApY0E19aoWFuuzLdkTlbPwizsYj__N7RwD8DFUdk_wBseCjfgM4AMV4AZrr8CevD6PhZuBAULwQ4w0QGXuir_f4yqbnRcazXylZuXpns9sHFi_jwkBid-qV1TtnlVzz5VegvRqofSJwvAAOHwdRLgLef2dkw1D00cDWsOgFXT-memUolIYgpeQzGtM5ucZAhdvQKs2BznFLPvZERuGXg8ttRlZ-BbgTrpNZaorr73H4c3g_v7YXn9VM6eOsMLPk-KPIM4Ob8MCge0GB9cBvubZG4Vdvgt9dwWMqov-v45K-xci3KDrPuYgF5U2G6SJfPWImvNFuQW2ZlJ3NLQwdgi7QdHsz7-pCe0L0CuqNfWW6TjJIMGyTilgqJc0JGlIBd0Wi62yeDmury6i_xujEglSf4ecZNrwbMCwg0ppIm51t2ugnA9jqUEH1KnTKc5t2lXsq5CUh6rUvBvRSZjxWwetwlNGM-ZYhy0sGDSGplrpVRheYyOnNG75KB-MUMv8JMhrjBDLuMi2_v5eJ-sNRJ4QFYtHJtDsoJ_6iOH2Bc8LEVn

   Welchman, Gordon

   Intelligence And National Security, Vol. 32, Issue 2, p. 244.

   Gordon Welchman was a Cambridge mathematician, who arrived at Bletchley Park (BP) on 4 September 1939 and worked there throughout World War Two. His remarkable contribution to BP's wartime success ... Read more

   Gordon Welchman was a Cambridge mathematician, who arrived at Bletchley Park (BP) on 4 September 1939 and worked there throughout World War Two. His remarkable contribution to BP's wartime success was achieved without any previous experience of cryptography or signals intelligence. He was in fact, a lecturer in algebraic geometry and Dean at Sidney Sussex College, Cambridge. In 1938, he was approached by Alastair Denniston, the head of the Foreign Office's cryptography section, the Government Code and Cypher School (GC&CS). He accepted Denniston's request that in the event of war, he make himself available for intelligence work and in March 1939, attended a brief course on the principles of cryptography. In the early years of World War Two he was transformed into a key figure in the triumph of BP. Within two months of his arrival, he had independently reinvented a key part of the pre-war work of Polish cryptographers and also laid the foundations for SIXTA (Hut 6 traffic analysis), a fusion of signals intelligence and cryptography. After a further month he had made three fundamental contributions to the ultimate success of BP: he was one of the first to recognise the need for a rapid expansion of BP's infrastructure for the decryption and analysis of intercepted Enigma traffic; he drew up an organisational plan which would enable BP to achieve such an expansion; he invented a device which would transform Alan Turing's design for the Bombe into a workable machine. Along with Turing, he had in effect developed a radically new production-orientated approach to machine cryptanalysis. BP then turned to Welchman to put his organisational plan in place and he took on the leadership of the group which would ultimately decrypt over one million German Air Force and Army signals. Read less

   Journal Article

2. The commercial use of codes 1965

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwpV1LS8QwEB7UvXjxgYJvg4i3UJsmpIVlRcTFH7D3pc2DBXGrlP3_zqQJZk978NySkGQy3ySZ-T6AR4mo6byyvDSd51I1HW8RaXmrrXdGWK-N277MGXVOqRYmrm9yi8FX297QNXmhGsp5LJ9fvn84yUbR82rU0NiHiUBLI0PXiyweQvQqcz63qiSCtyyeofTKrHBUod_I8L7EI1xO5kJc5E1GBqPwsFP94S-J_lSijiG34qTvte3jRQSu-TF8piGHfBVSScgT94tAlhgYMhIx5D-m5wSOYnzLXkeDPIU9tz6DBzRGho18kbwTft0MjvWeTVczqqgfpsVqdg5P8_fF2wdPnS7RAOlVoV27fjMsU7fiAlgldS2N1LivW9l519XWGNN4TSLttbOXcL-jlaudf1zDIbEgjtkzNzDxuE3dLRzQzN2F5f8FLla4lQ

   Lefevre, Harold

   Bankers' Magazine, Vol. 199, pp. 275 - 278.

   Journal Article

3. Versatile passkey to communication: business equipment manufactures already are gambling that a... 1963

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwpV1LT8JAEF4fJMYTvhLfzsF4YkMorQUlGEIkcjEYuRlDtvsQI1Cg7YF_70zbNaAmHrw309nu7Mx0dub7GLt0MWpq4ylekYHhrlcPuMBIy4WvjJaOMr7Uq8WcjOeUZmHy_bVuMfXVKpRUJi97dfw_8Zzru-mME20UXa_mHBobrOCgpZGh-_2nryILHiHML3LWPJ8THd2qz63mgaRTZB9WhbR_hFgLlhvpyyl4YYpYYYEa_6HuDita_GhoZRayy9b1ZI9t2X73_bVHqpjh9ow0TDGRxjMNcQhyeW7kBnKqygj0LHlPO4xgLCYJTUUk-L8OhGoq1ALEXMObGAc04w7xUMQgAPN2sAULaAybNETfKA-bgFn6CAINQlJrjVa30Gs9t7tdeOkRdUOkFdj7pN8FYL4NOfArqQkEfTHPJplfS9_fvLKi6Icc6pSFmAI3Gj5VEEuZfrNEqHkyxa-DmTJk_CkQGogW4yAc4cohw8IG0jKJ9AG76tz32w_cbtYA5dHtiJjoMIkGdrucQwZV16-50vXRPwk3MDqoKSll3fhENl_T6ohd_CHl-M8nTtg2eT9qO6t4p6xg0N3oM7ZJFneemvEntTYR0w

   Bloomberg Businessweek (Online), p. 128.

   Magazine Article

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