Table of Contents
Northern Europe, circa 1940 --An18th-century cipher --Theworld's first ciphering machine --Damm, Hagelin, and Gyldâen --Radio signal interception and cryptanalysis before 1939 --War --Enter Arne Beurling --TheRussian Baltic Navy --Mysterious signals --Teleprinters --Beurling's analysis --TheG-Schreiber and the Apps --Continued cryptanalysis --Exit Gyldâen, but Beurling comes back --thedouble transposition --Operation Barbarossa --Thework place --Contents --Thebirth of the FRA --Brilliant results despite everything --Downturn and leakage --TheRed Army and the Arctic Sea --thedoubly enciphered Russian code --Stella Polaris --Gradual loss of German traffic --Borelius pays a visit to the Germans --Information, but of what value --Norway -- Thelast years of the war --TheSwedes' own crypto systems --Arne Beurling 1943-1945 --Arne Beurling --Through the eyes of a woman --Amagical friendship.