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Harold Keen
Harold Hall "Doc" Keen (1894–1973) was a British engineer who produced the engineering design, and oversaw the construction of, the British bombe, a codebreaking machine used in World War II to read German messages sent using the Enigma machine. He was known as "Doc" Keen because of his habit of carrying tools and paperwork in a case resembling a doctor's bag. After the war he was awarded the O.B.E. Career before World War II Keen was born in the borough of Shoreditch in east London in 1894. By age 18 he had moved to Kentish Town and began studying Electrical Engineering. In 1912 he joined the British Tabulating Machine Company (BTM), established to import and assemble American punched card technology. In 1916, Keen joined the Royal Flying Corps and was assigned to the ground staff of a bomber squadron in northern France. In 1919 he returned to BTM and married an Eva Burningham. In 1921, Keen moved with BTM to Letchworth in Hertfordshire. Two years later, he was appointed he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engineer
Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the limitations imposed by practicality, regulation, safety and cost. "Science is knowledge based on our observed facts and tested truths arranged in an orderly system that can be validated and communicated to other people. Engineering is the creative application of scientific principles used to plan, build, direct, guide, manage, or work on systems to maintain and improve our daily lives." The word ''engineer'' (Latin ) is derived from the Latin words ("to contrive, devise") and ("cleverness"). The foundational qualifications of an engineer typically include a four-year bachelor's degree in an engineering discipline, or in some jurisdictions, a master's degree in an engineering discipline plus four to six years of peer-reviewed professiona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hertfordshire
Hertfordshire ( or ; often abbreviated Herts) is one of the home counties in southern England. It borders Bedfordshire and Cambridgeshire to the north, Essex to the east, Greater London to the south, and Buckinghamshire to the west. For government statistical purposes, it forms part of the East of England region. Hertfordshire covers . It derives its name – via the name of the county town of Hertford – from a hart (stag) and a ford, as represented on the county's coat of arms and on the flag. Hertfordshire County Council is based in Hertford, once the main market town and the current county town. The largest settlement is Watford. Since 1903 Letchworth has served as the prototype garden city; Stevenage became the first town to expand under post-war Britain's New Towns Act of 1946. In 2013 Hertfordshire had a population of about 1,140,700, with Hemel Hempstead, Stevenage, Watford and St Albans (the county's only ''city'') each having between 50,000 and 100,000 r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptanalysis Of The Enigma
Cryptanalysis of the Enigma ciphering system enabled the western Allies in World War II to read substantial amounts of Morse-coded radio communications of the Axis powers that had been enciphered using Enigma machines. This yielded military intelligence which, along with that from other decrypted Axis radio and teleprinter transmissions, was given the codename '' Ultra''. The Enigma machines were a family of portable cipher machines with rotor scramblers. Good operating procedures, properly enforced, would have made the plugboard Enigma machine unbreakable. However, most of the German military forces, secret services, and civilian agencies that used Enigma employed poor operating procedures, and it was these poor procedures that allowed the Enigma machines to be reverse-engineered and the ciphers to be read. The German plugboard-equipped Enigma became Nazi Germany's principal crypto-system. In December 1932 it was "broken" by mathematician Marian Rejewski at the Polish G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eastcote
Eastcote is a suburban area in the London Borough of Hillingdon, in northwest London. In the Middle Ages, Eastcote was one of the three areas that made up the parish of Ruislip, under the name of Ascot. The name came from its position to the east of the parish. While no historically significant events have taken place in Eastcote, there are links to past events in the history of Britain. One such example is of Lady Mary Bankes, who lived in Eastcote for a time, and led the defence of Corfe Castle in Dorset against the Roundheads during the English Civil War. Eastcote also housed an outstation of the Bletchley Park codebreaking activities during the Second World War, with several codebreaking computers in use. This operation became the precursor to GCHQ, which remained in Eastcote after the war until the department moved to purpose-built buildings in Cheltenham in 1952. By the turn of the 20th century, the recorded population was around 600; this had reached for the ward i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stanmore
Stanmore is part of the London Borough of Harrow in London. It is centred northwest of Charing Cross, lies on the outskirts of the London urban area and includes Stanmore Hill, one of the highest points of London, at high. The district, which developed from the ancient Middlesex parishes of Great and Little Stanmore, lies immediately west of Roman Watling Street (the A5 road) and forms the eastern part of the modern London Borough of Harrow. Stanmore is the location of the former RAF Bentley Priory station - base of the Fighter Command during both world wars - along with its accommodating Bentley Priory mansion, notably the last residence of Queen Adelaide. Some members of the Bernays family were also based here, including Adolphus Bernays and his son and grandson who were both rectors of St John's church; the Bernays Institute and Bernays Gardens are public amenities in the centre of the old village. The district increasingly developed into a London suburb during the 20t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wavendon
Wavendon is a village and civil parish in the south east of the Milton Keynes urban area, in Buckinghamshire, England. History and geography The village name is an Old English language word, and means 'Wafa's hill'. In the '' Anglo-Saxon Chronicle'' in 969 the village was recorded as ''Wafandun''. The ancient village lies just outside the 1967 designated area of Milton Keynes. The ecclesiastic parish of Wavendon anciently contained the hamlet of Woburn Sands (originally known as 'Hogsty End, Wavendon'), which became a separate civil parish in 1907. The parishes are separated by the Marston Vale line. Wavendon Tower Wavendon Tower is a large country house with substantial modern additions on the edge of the village. During the Second World War it was used as a recording studio for black propaganda. From 1969 to the late 1970s, it was the base for the Milton Keynes Development Corporation. Until 2011 it was an operating centre for Scicon (subsequently EDS). In 2012, Landar L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gayhurst
Gayhurst is a village and civil parish in the unitary authority area of the City of Milton Keynes, Buckinghamshire, England. It is about two and a half miles NNW of Newport Pagnell. The village name is an Old English language word meaning 'wooded hill where goats are kept'. In the Domesday Book in 1086 it was recorded as ''Gateherst''; later names include Goathurst. At that time the manor was owned by Bishop Odo of Bayeux. History In 1582, Queen Elizabeth I made a grant of Gayhurst Manor "in the event of its reversion to the Crown" to Sir Francis Drake, but there is no record that he ever received it. The house once belonged to Sir Everard Digby (1578–1606), one of the conspirators in the Gunpowder Plot of 1605. His son Sir Kenelm Digby, (1603–1665) was an English courtier, diplomat, natural philosopher and astrologer. He was born at Gayhurst. Gayhurst had an outstation from the Bletchley Park codebreaking establishment, where one of the Bombes used to decode Ger ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adstock
''For the municipality in Quebec, see Adstock, Quebec'' Adstock is a village and civil parish about northwest of Winslow and southeast of Buckingham in the Aylesbury Vale district of Buckinghamshire. The 2001 Census recorded a parish population of 415 reducing to 363 at the 2011 Census. There are remains of a Roman road in the village. In the divisions of England that took place between AD 613 and 1017, Buckinghamshire was divided into eight hundreds. The manor of Adstock originally formed part of the Votesdune Hundred, then merged into the Ashendon Hundred and was finally absorbed into the Buckingham Hundred. At that time it was surrounded by the Bernwood, one of the most important Royal Forests. At the end of the 10th century, Adstock formed a portion of the Lands of Godwine, Earl of Kent and his second wife Gytha Thorkelsdóttir. After the Norman conquest of England, its name was recorded in the Domesday Book of 1086 as ''Edestoche'' which is Old English and means '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gordon Welchman
William Gordon Welchman (15 June 1906 – 8 October 1985) was a British mathematician. During World War II, he worked at Britain's secret codebreaking centre, "Station X" at Bletchley Park, where he was one of the most important contributors. After the war he moved to the US, and worked on the design of military communications systems. Early life, education and career Gordon Welchman was born, the youngest of three children, at Fishponds in Bristol, to William Welchman (1866–1954) and Elizabeth Marshall Griffith. William was a Church of England priest who had been a missionary overseas before returning to England as a country vicar, eventually becoming archdeacon of Bristol. Elizabeth was the daughter of another priest, the Revd Edward Moule Griffith. Welchman was educated at Marlborough College and then studied mathematics at Trinity College, Cambridge, from 1925 to 1928. In 1929, he became a Research Fellow in Mathematics at Sidney Sussex College, Cambridge. He became a Fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Known Plaintext Attack
The known-plaintext attack (KPA) is an attack model for cryptanalysis where the attacker has access to both the plaintext (called a crib), and its encrypted version (ciphertext). These can be used to reveal further secret information such as secret keys and code books. The term "crib" originated at Bletchley Park, the British World War II decryption operation, where it was defined as: History The usage "crib" was adapted from a slang term referring to cheating (e.g., "I cribbed my answer from your test paper"). A "crib" originally was a literal or interlinear translation of a foreign-language text—usually a Latin or Greek text—that students might be assigned to translate from the original language. The idea behind a crib is that cryptologists were looking at incomprehensible ciphertext, but if they had a clue about some word or phrase that might be expected to be in the ciphertext, they would have a "wedge," a test to break into it. If their otherwise random attacks on the ci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Known-plaintext Attack
The known-plaintext attack (KPA) is an attack model for cryptanalysis where the attacker has access to both the plaintext (called a crib), and its encrypted version (ciphertext). These can be used to reveal further secret information such as secret keys and code books. The term "crib" originated at Bletchley Park, the British World War II decryption operation, where it was defined as: History The usage "crib" was adapted from a slang term referring to cheating (e.g., "I cribbed my answer from your test paper"). A "crib" originally was a literal or interlinear translation of a foreign-language text—usually a Latin or Greek text—that students might be assigned to translate from the original language. The idea behind a crib is that cryptologists were looking at incomprehensible ciphertext, but if they had a clue about some word or phrase that might be expected to be in the ciphertext, they would have a "wedge," a test to break into it. If their otherwise random attacks on the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alan Turing
Alan Mathison Turing (; 23 June 1912 – 7 June 1954) was an English mathematician, computer scientist, logician, cryptanalyst, philosopher, and theoretical biologist. Turing was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general-purpose computer. He is widely considered to be the father of theoretical computer science and artificial intelligence. Born in Maida Vale, London, Turing was raised in southern England. He graduated at King's College, Cambridge, with a degree in mathematics. Whilst he was a fellow at Cambridge, he published a proof demonstrating that some purely mathematical yes–no questions can never be answered by computation and defined a Turing machine, and went on to prove that the halting problem for Turing machines is undecidable. In 1938, he obtained his PhD from the Department of Mathemati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
