This is the last untold story of Bletchley Park. Using declassified information, Paul Gannon gives us a gripping account of the invention of the world's first true computer, Colossus. Uncover the secrets of Bletchley Park's code-breaking computers. In 1940, almost a year after the outbreak of the Second World war, Allied radio operators at an interception station in South London began picking up messages in a strange new code. Using science, maths, innovation and improvisation Bletchley Park codebreakers worked furiously to invent a machine to decipher what turned out to be the secrets of Nazi high command. It was called Colossus. What these codebreakers didn't realize was that they had to fashion the world's first true computer. When the war ended, this incredible invention was dismantled and hidden away for almost 50 years. Paul Gannon has pieced together the tremendous story of what is now recognized as the greatest secret of Bletchley Park. 'Gannon's book contains a mass of utterly fascinating and largely unknown material about an immensely important wartime project, and is very welcome indeed.' - Brian Rendell, TES

Extensive revision of the best-selling text on satellite communications — includes new chapters on cubesats, NGSO satellite systems, and Internet access by satellite There have been many changes in the thirty three years since the first edition of Satellite Communications was published. There has been a complete transition from analog to digital communication systems, withanalog techniques replaced by digital modulation and digital signal processing. While distribution of television programming remains the largest sector of commercial satellite communications, low earth orbit constellations of satellites for Internet access are set to challenge that dominance. In the third edition, chapters one through three cover topics that are specific to satellites, including orbits, launchers, and spacecraft. Chapters four through seven cover the principles of digital communication systems, radio frequency communications, digital modulation and multiple access techniques, and propagation in the earth’s atmosphere, topics that are common to all radio communication systems. Chapters eight through twelve cover applications that include non-geostationary satellite systems, low throughput systems, direct broadcast satellite television, Internet access by satellite, and global navigation satellite systems. The chapter on Internet access by satellite is new to the third edition, and each of the chapters has been extensively revised to include the many changes in the field since the publication of the second edition in 2003. Two appendices have been added that cover digital transmission of analog signals, and antennas. An invaluable resource for students and professionals alike, this book: Focuses on the fundamental theory of satellite communications Explains the underlying principles and essential mathematics required to understand the physics and engineering of satellite communications Discusses the expansion of satellite communication systems in areas such as direct-broadcast satellite TV, GPS, and internet access Introduces the rapidly advancing field of small satellites, referred to as SmallSats or CubeSats Provides relevant practice problems based on real-world satellite systems Satellite Communications is required reading for undergraduate and postgraduate students in satellite communications courses and an authoritative reference for engineers working in communications, systems and networks, and satellite operations and management.

This book is an edition of the General Report on Tunny with commentary that clarifies the often difficult language of the GRT and fitting it into a variety of contexts arising out of several separate but intersecting story lines, some only implicit in the GRT. Explores the likely roots of the ideas entering into the Tunny cryptanalysis Includes examples of original worksheets, and printouts of the Tunny-breaking process in action Presents additional commentary, biographies, glossaries, essays, and bibliographies

With the use of false transmissions and forged documents on a strategically placed dead body, Britain was able to perpetuate a great ruse on the Nazi Machine.

The methods developed by British intelligence in the early twentieth century continue to resonate today. Much like now, the intelligence activity of the British in the pre-Second World War era focused on immediate threats posed by subversive, clandestine networks against a backdrop of shifting great power politics. Even though the First World War had ended, the battle against Britain's enemies continued unabated during the period of the 1920s and 1930s. Buffeted by political interference and often fighting for their very survival, Britain's intelligence services turned to fight a new, clandestine war against rising powers Soviet Russia and Nazi Germany. Using recently declassified files of the British Security Service (MI5), The Secret War Between the Wars details the operations and tradecraft of British intelligence to thwart Communist revolutionaries, Soviet agents, and Nazi sympathizers during the interwar period. This new study charts the development of British intelligence methods and policies in the early twentieth century and illuminates the fraught path of intelligence leading to the Second World War. An analysis of Britain's most riveting interwar espionage cases tells the story of Britain's transition between peace and war. The methods developed by British intelligence in the early twentieth century continue to resonate today. Much like now, the intelligence activity of the British in the pre-Second World War era focused on immediate threats posed by subversive, clandestine networks against a backdrop of shifting great power politics. As Western countries continue to face the challenge of terrorism, and in an era of geopolitical change heralded by the rise of China and the resurgence of Russia, a return to the past may provide context for a better understanding of the future. Kevin Quinlan received his PhD in History from the University of Cambridge. He works in Washington, DC.

A sweeping, in-depth history of NSA, whose famous “cult of silence” has left the agency shrouded in mystery for decades The National Security Agency was born out of the legendary codebreaking programs of World War II that cracked the famed Enigma machine and other German and Japanese codes, thereby turning the tide of Allied victory. In the postwar years, as the United States developed a new enemy in the Soviet Union, our intelligence community found itself targeting not soldiers on the battlefield, but suspected spies, foreign leaders, and even American citizens. Throughout the second half of the twentieth century, NSA played a vital, often fraught and controversial role in the major events of the Cold War, from the Korean War to the Cuban Missile Crisis to Vietnam and beyond. In Code Warriors, Stephen Budiansky—a longtime expert in cryptology—tells the fascinating story of how NSA came to be, from its roots in World War II through the fall of the Berlin Wall. Along the way, he guides us through the fascinating challenges faced by cryptanalysts, and how they broke some of the most complicated codes of the twentieth century. With access to new documents, Budiansky shows where the agency succeeded and failed during the Cold War, but his account also offers crucial perspective for assessing NSA today in the wake of the Edward Snowden revelations. Budiansky shows how NSA’s obsession with recording every bit of data and decoding every signal is far from a new development; throughout its history the depth and breadth of the agency’s reach has resulted in both remarkable successes and destructive failures. Featuring a series of appendixes that explain the technical details of Soviet codes and how they were broken, this is a rich and riveting history of the underbelly of the Cold War, and an essential and timely read for all who seek to understand the origins of the modern NSA.

Did Hitler—code name “Grey Wolf”—really die in 1945? Gripping new evidence shows what could have happened. The basis for the titular documentary. When Truman asked Stalin in 1945 whether Hitler was dead, Stalin replied bluntly, “No.” As late as 1952, Eisenhower declared: “We have been unable to unearth one bit of tangible evidence of Hitler’s death.” What really happened? Simon Dunstan and Gerrard Williams have compiled extensive evidence—some recently declassified—that Hitler actually fled Berlin and took refuge in a remote Nazi enclave in Argentina. The recent discovery that the famous “Hitler’s skull” in Moscow is female, as well as newly uncovered documents, provide powerful proof for their case. Dunstan and Williams cite people, places, and dates in over 500 detailed notes that identify the plan’s escape route, vehicles, aircraft, U-boats, and hideouts. Among the details: the CIA’s possible involvement and Hitler’s life in Patagonia—including his two daughters. “Describes a ghastly pantomime played out in the names of the Fuhrer and the woman who had been his mistress.” —The Sun “Grey Wolf is more than a conspiracy yarn . . . Its authors show Hitler’s escape was possible . . . a gripping read.” —South China Morning Post “Remarkable detail.” —Sir David Frost, Frost Over the World “Stunning saga of intrigue.” —Pravda “Stunning account of the last days of the Reich.” —Parapolitical.com “I thought the book was hugely thought-provoking and explores some of the untold, murky loose ends of World War Two.” —Dan Snow, broadcaster and historian, The One Show BBC 1 “Laid out in lavish detail.” —Daily Mail

This is an updated guide to the military sites around Britain and Ireland where the great events of history took place. It includes sites from the distant prehistoric past, through two World Wars, to the tensions and intrigues of the Cold War.