'Intrepid': Myth and Reality

Abstract

Part 1 No good, not even for intelligence: the end of the black chamber William F. Friedman picks up the pieces I had the good sense to get out of it! room 40 Winston Churchill, an early convert the Foreign Office, late convert the Soviet intercepts strategic future for intelligence. Part 2 Nature of the beast: the birth of codebreaking machine ciphers, Poland and the Enigma depth reading the distinct limitations of thievery solving the red machine. Part 3 Il y du nouveau: 1939, dark new year meeting at Pyry Forest Marian Rejewski's mathematical feat recovering the daily Enigma keys Alan Turing and other men of the professor type Bletchley Park the Poles' flight. Part 4 Fighting back: British mathematicians vs. the Enigma the bombe takes shape a pile of dull, disjointed and enigmatic scraps cryptanalytic talent Norway and yellow France and red HMS Glorious. Part 5 Impossible problems: the sinking of U-33 naval Enigma and the bombe operation Ruthless and other straws American isolationism purple the British charm offensive mission to Bletchley, bearing gifts. Part 6 Success breeds success: the Blitz Cape Matapan Boniface, Barbarossa and Bismarck naval Enigma, U-110 and the trawler pinches the eastern front and German atrocities Trafalgar Day cribs and continuity. Part 7 The machines: the British make polite noises IBM machines and JN-25 the machine attack on Floradora Washington at war military vs. civilians an American ultimatum better bombes high-speed analyzers. Part 8 Paranoia is our profession: Donitz's suspicions the evacuation of Corregidor the Midway leak some bungled operations do not talk at meals suspicions among friends. Part 9 The shadow war: calling the shots in the Mediterranean Torch and deception the flight from Vichy Atlantic convoys U-559 and the breaking of Shark the hunt for leaks the American invasion pressure and diversions women in uniform. Part 10 Command of the ether: Russian espionage and project Venona GEE and fish masters of deception Yamamoto the Water Transport code failure in the Ardennes signalling the end. Part 11 Epilogue: legacy. Appendices: chronology naval enigma - its indicating system and the method of banburismus cryptanalysis of the purple machine the intercept network rapid analytical machinery (RAM).