Cryptanalysis of the Enigma immense problem and it gave a great deal of trouble. Work on a high speed machine had been started by Wynn-Williams of the TRE late in 1941 and some nine months later Harold Keen of BTM started work independently. Early in 1942, Bletchley Park were a long way from possessing a high speed machine of any sort. Eventually, after a long period of being unable to decipher U-boat messages, a source of cribs was found. This was the Kurzsignale (short signals), a code which the German navy used to minimize the duration of transmissions, thereby reducing the risk of being
The Kingdom of the Netherlands During World War II volume 7 how his family fared during the war, and reflected on his family's history in volume 12. The Kingdom of the Netherlands During World War II The Kingdom of the Netherlands During World War II () is the standard reference on the history of the Netherlands during World War II. The series was written by Loe de Jong (1914–2005), director of the Dutch Institute for War Documentation ("Nederlands Instituut voor Oorlogsdocumentatie", or NIOD), and was published between 1969 and 1991. The series contains 14 volumes, published in 29 parts. De Jong was commissioned to write the work in 1955