The Fourth Rotor; Bletchley Park, Enigma M4, and the German Navy's Fatal Assumptions (Paperback)

Sprache: Englisch

Verlag: Truehistories, 2026

9798235344143

Anbieter: Grand Eagle Retail, Bensenville, IL, USAGrand Eagle Retail

Verkäufer/-in mit 5 Sternen

Verkäufer:in bei AbeBooks seit 12. Oktober 2005

Softcover

Zustand: Neu

EUR 19,21

 Versand gratis 
Versand innerhalb von USA

Anzahl: 1 verfügbar

In den Warenkorb
30 Tage kostenlose Rückgabe

Artikelbeschreibung des Verkäufers

Paperback. On February 1, 1942, the Atlantic went dark.German U-boats had begun using Enigma M4, a strengthened naval cipher machine fitted with a fourth rotor. At Bletchley Park, the principal Atlantic U-boat network, known to Germany as Triton and to British cryptanalysts as Shark, suddenly became unreadable.For ten critical months, the German Navy directed its submarine campaign through a communications system it believed was beyond practical penetration.The Fourth Rotor reconstructs the hidden intelligence struggle behind that confidence. Rather than repeating the familiar story of one brilliant codebreaker defeating one machine, Matthew Nichols examines the larger system that made both German success and eventual Allied penetration possible.The story moves from the Polish mathematical attack on Enigma and the dangerous capture of documents from U-110 to the introduction of M4, the American coastal offensive, Karl Doenitz's radio-controlled wolf packs, German B-Dienst successes against Allied communications, and the fatal recovery of cipher books from the sinking U-559.At the center of the book is a question more consequential than how Enigma was broken: Why did the German naval command continue to trust it?Doenitz and his communications specialists were not careless. They imposed radio discipline, shortened transmissions, developed destruction procedures, strengthened the machine, and investigated suspicious Allied successes. Yet every plausible alternative explanation, radar, direction finding, aircraft reconnaissance, captured charts, agents, and operational coincidence, helped preserve confidence in the cipher.The machine became the alibi.Drawing upon translated German U-boat command war diaries, declassified intelligence studies, naval histories, Bletchley Park records, museum documentation, and established scholarship, The Fourth Rotor separates verified history from popular simplification. It restores the Polish cryptanalysts, naval boarding parties, intercept operators, Hut 8 analysts, bombe operators, intelligence officers, escort crews, and merchant sailors to a story too often reduced to a single name.This is not merely the history of a code being broken. It is the documented account of a command structure that mistook cryptographic complexity for operational invisibility, and of the men at sea who paid for that assumption.For readers interested in Bletchley Park, Enigma, U-boat warfare, intelligence history, naval operations, and the Battle of the Atlantic. This item is printed on demand. Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

Titel
The Fourth Rotor; Bletchley Park, Enigma M4, and the German Navy's Fatal Assumptions (Paperback)
Autor
Matthew Nichols
Verlag
Truehistories
Erscheinungsjahr
2026
Zustand
new
Einband
Paperback
Sprache
Englisch
ISBN-13
9798235344143

Grand Eagle Retail

Bensenville, IL, USA

Verkäufer/-in mit 5 Sternen

Verkäufer:in bei AbeBooks seit 12. Oktober 2005

Versandkosten innerhalb von USA

Artikel6 bis 14 Werktage6 bis 16 Werktage
Erster ArtikelEUR 0,00EUR 0,00
Die Versandzeiten werden von den Verkäuferinnen und Verkäufern festgelegt. Sie variieren je nach Versanddienstleister und Standort. Sendungen, die den Zoll passieren, können Verzögerungen unterliegen. Eventuell anfallende Abgaben oder Gebühren sind von der Käuferin bzw. dem Käufer zu tragen. Die Verkäuferin bzw. der Verkäufer kann Sie bezüglich zusätzlicher Versandkosten kontaktieren, um einen möglichen Anstieg der Versandkosten für Ihre Artikel auszugleichen.

Zahlungsarten

  • Visa
  • Mastercard
  • American Express
  • Carte Bleue
  • Apple Pay
  • Google Pay

Unternehmensdaten der Verkäuferin bzw. des Verkäufers

APOLLO ONLINE CORP.

605 Geddes Street
Wilmington, DE USA 19805