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Ultra (cryptography)
Ultra was the designation adopted by United Kingdom, British military intelligence in June 1941 for wartime signals intelligence obtained by breaking high-level encrypted enemy radio and teleprinter communications at the Government Code and Cypher School (GC&CS) at Bletchley Park. ''Ultra'' eventually became the standard designation among the western Allies of World War II, Allies for all such intelligence. The name arose because the intelligence obtained was considered more important than that designated by the highest British Classified information, security classification then used (''Most Secret'' and so was regarded as being ''Ultra Secret''. Several other cryptonyms had been used for such intelligence. The code name "Boniface" was used as a cover name for ''Ultra''. In order to ensure that the successful code-breaking did not become apparent to the Germans, British intelligence created a fictional MI6 master spy, Boniface, who controlled a fictional series of agents throug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enigma Machine
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the Wehrmacht, German military. The Enigma machine was considered so secure that it was used to encipher the most top-secret messages. The Enigma has an electromechanical Rotor machine, rotor mechanism that scrambles the 26 letters of the alphabet. In typical use, one person enters text on the Enigma's keyboard and another person writes down which of the 26 lights above the keyboard illuminated at each key press. If plaintext is entered, the illuminated letters are the ciphertext. Entering ciphertext transforms it back into readable plaintext. The rotor mechanism changes the electrical connections between the keys and the lights with each keypress. The security of the system depends on machine settings that were generally changed daily, based ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nazi Germany
Nazi Germany, officially known as the German Reich and later the Greater German Reich, was the German Reich, German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a Totalitarianism, totalitarian dictatorship. The Third Reich, meaning "Third Realm" or "Third Empire", referred to the Nazi claim that Nazi Germany was the successor to the earlier Holy Roman Empire (800–1806) and German Empire (1871–1918). The Third Reich, which the Nazis referred to as the Thousand-Year Reich, ended in May 1945, after 12 years, when the Allies of World War II, Allies defeated Germany and entered the capital, Berlin, End of World War II in Europe, ending World War II in Europe. After Hitler was appointed Chancellor of Germany in 1933, the Nazi Party began to eliminate political opposition and consolidate power. A 1934 German referendum confirmed Hitler as sole ''Führer'' (leader). Power was centralised in Hitler's person, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atomic Bomb
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission or atomic bomb) or a combination of fission and fusion reactions (thermonuclear weapon), producing a nuclear explosion. Both bomb types release large quantities of energy from relatively small amounts of matter. Nuclear bombs have had yields between 10 tons (the W54) and 50 megatons for the Tsar Bomba (see TNT equivalent). Yields in the low kilotons can devastate cities. A thermonuclear weapon weighing as little as can release energy equal to more than 1.2 megatons of TNT (5.0 PJ). Apart from the blast, effects of nuclear weapons include firestorms, extreme heat and ionizing radiation, radioactive nuclear fallout, an electromagnetic pulse, and a radar blackout. The first nuclear weapons were developed by the Allied Manhattan Project during World War II. Their production continues to require a large scientific and industrial complex, primari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Keegan
Sir John Desmond Patrick Keegan (15 May 1934 – 2 August 2012) was an English military historian, lecturer, author and journalist. He wrote many published works on the nature of combat between prehistory and the 21st century, covering land, air, maritime, intelligence warfare and the psychology of battle. Life and career Keegan was born in Clapham to an Irish World War I veteran and was evacuated to Somerset when World War II broke out. At the age of 13, Keegan contracted orthopaedic tuberculosis, which subsequently affected his gait. The long-term effects of this rendered him unfit for military service, and the timing of his birth made him too young for service in the Second World War, facts he mentioned in his works as an ironic observation on his profession and interests. The illness also interrupted his education in his teenage years, although it included a period at King's College, Taunton and two years at Wimbledon College, which led to entry to Balliol College, Oxford ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Counterfactual History
Counterfactual history (also virtual history) is a form of historiography that attempts to answer the ''wikt:what if, What if?'' questions that arise from counterfactuals, counterfactual conditions. Counterfactual history seeks by "conjecturing on what did not happen, or what might have happened, in order to understand what did happen." It has produced a literary genre which is variously called alternate history, speculative history, allohistory, and hypothetical history. Development An early book of counterfactual histories is ''If It Had Happened Otherwise'' (1931) which features "If Lee Had Not Won the Battle at Gettysburg", by Winston Churchill, about a fictional Confederate victory at the Battle of Gettysburg (1863). As a text of counterfactual histories written by historians, ''If It Had Happened Otherwise'' contains works of Alternate history, alternative history—fictional reinterpretations of historical events—because the narrative tone tends to whimsy, and offers nei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harry Hinsley
Sir Francis Harry Hinsley, (26 November 1918 – 16 February 1998) was an English intelligence officer and historian. He worked at Bletchley Park during the Second World War and wrote widely on the history of international relations and British Intelligence during the Second World War. He was known as Harry Hinsley. Early life Hinsley's father worked in the coal department of the Walsall Co-Op. His mother Emma Hinsley (née Adey) was a school caretaker and they lived in Birchills, in the parish of St Andrew's, Walsall. Harry was educated at Queen Mary's Grammar School, Walsall and, in 1937, won a scholarship to read history at St. John's College, Cambridge.Langhorne, 2004 He went on to be awarded a first in part one of the Historical Tripos. In August 1939, Hinsley visited his girlfriend in the German city of Koblenz. Police required him to report to the police station daily. However, this requirement was waived following the signing of the German-Soviet Pact. A week la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dwight D
Dwight may refer to: People and fictional characters * Dwight (given name), including a list of people and fictional characters * Dwight (surname), a list of people Places Canada * Dwight, Ontario, village in the township of Lake of Bays, Ontario United States * Dwight (neighborhood), part of an historic district in New Haven, Connecticut * Dwight, Illinois, a village * Dwight, Kansas, a city * Dwight, Massachusetts, a village * Dwight, Michigan, an unincorporated community * Dwight, Nebraska, a village * Dwight, North Dakota, a city * Dwight Township, Livingston County, Illinois * Dwight Township, Michigan Other uses * Dwight Airport, a public-use airport north of Dwight, Illinois * Dwight Correctional Center, a maximum security prison for adult females in Illinois * Dwight School, New York City {{disambig, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Secret Intelligence Service
The Secret Intelligence Service (SIS), commonly known as MI6 (MI numbers, Military Intelligence, Section 6), is the foreign intelligence service of the United Kingdom, tasked mainly with the covert overseas collection and analysis of Human intelligence (intelligence gathering), human intelligence on foreign nationals in support of its Five Eyes partners. SIS is one of the British intelligence agencies and the Chief of the Secret Intelligence Service ("C") is directly accountable to the Foreign Secretary (United Kingdom), Foreign Secretary. Formed in 1909 as the foreign section of the Secret Service Bureau, the section grew greatly during the World War I, First World War, officially adopting its current name around 1920. The name "MI6" originated as a convenient label during the World War II, Second World War, when SIS was known by many names. It is still commonly used today. The existence of SIS was not officially acknowledged until 1994. That year the Intelligence Services A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stewart Menzies
Major General Sir Stewart Graham Menzies, (; 30 January 1890 – 29 May 1968) was Chief of MI6, the British Secret Intelligence Service (SIS), from 1939 to 1952, during and after the Second World War. Early life, family Stewart Graham Menzies was born in England in 1890 into a wealthy family as the second son of John Graham Menzies and Susannah West Wilson, daughter of ship-owner Arthur Wilson of Tranby Croft. His grandfather, Graham Menzies, was a whisky distiller who helped establish a cartel and made huge profits. His parents became friends of King Edward VII. Menzies was a nephew of Scottish Liberal Party politician and member of the House of Commons Robert Stewart Menzies. But Menzies' father was dissolute, never established a worthwhile career, and wasted his share of the family fortune; he died of tuberculosis in 1911 in his early 50s, leaving only a minimal estate. Menzies was educated at Eton College, becoming president of the student society Pop, and left in 1909 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
King George VI
George VI (Albert Frederick Arthur George; 14 December 1895 – 6 February 1952) was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death in 1952. He was also the last Emperor of India from 1936 until the British Raj was dissolved in August 1947, and the first head of the Commonwealth following the London Declaration of 1949. The future George VI was born during the reign of his great-grandmother Queen Victoria; he was named Albert at birth after his great-grandfather Prince Albert of Saxe-Coburg and Gotha and was known as "Bertie" to his family and close friends. His father ascended the throne as George V in 1910. As the second son of the king, Albert was not expected to inherit the throne. He spent his early life in the shadow of his elder brother, Edward, the heir apparent. Albert attended naval college as a teenager and served in the Royal Navy and Royal Air Force during the First World War. In 1920, he was made ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winston Churchill
Sir Winston Leonard Spencer Churchill (30 November 1874 – 24 January 1965) was a British statesman, military officer, and writer who was Prime Minister of the United Kingdom from 1940 to 1945 (Winston Churchill in the Second World War, during the Second World War) and again from 1951 to 1955. For some 62 of the years between 1900 and 1964, he was a Member of Parliament (United Kingdom), member of parliament (MP) and represented a total of five Constituencies of the Parliament of the United Kingdom, constituencies over that time. Ideologically an adherent to economic liberalism and imperialism, he was for most of his career a member of the Conservative Party (UK), Conservative Party, which he led from 1940 to 1955. He was a member of the Liberal Party (UK), Liberal Party from 1904 to 1924. Of mixed English and American parentage, Churchill was born in Oxfordshire into the wealthy, aristocratic Spencer family. He joined the British Army in 1895 and saw action in British R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JN-25
The vulnerability of Japanese naval codes and ciphers was crucial to the conduct of World War II, and had an important influence on foreign relations between Japan and the west in the years leading up to the war as well. Every Japanese code was eventually broken, and the intelligence gathered made possible such operations as the victorious American ambush of the Japanese Navy at Battle of Midway, Midway in 1942 (by breaking code JN-25b) and the shooting down of Japanese admiral Isoroku Yamamoto a year later in Operation Vengeance. The Imperial Japanese Navy (IJN) used many codes and ciphers. All of these cryptosystems were known differently by different organizations; the names listed below are those given by Western cryptanalytic operations. Red code The Red Book code was an IJN code book system used in World War I and after. It was called "Red Book" because the American photographs made of it were bound in red covers.Greg Goebel"US Codebreakers In The Shadow Of War" 2018. It sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
