Bletchley may refer to:
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Bletchley Park is an English country house and estate in Milton Keynes (Buckinghamshire) that became the principal centre of Allied code-breaking during the Second World War. The mansion was constructed during the years following 1883 for the financier and politician Sir Herbert Leon in the Victorian Gothic, Tudor, and Dutch Baroque styles, on the site of older buildings of the same name.
Colossus was a set of computers developed by British codebreakers in the years 1943–1945 to help in the cryptanalysis of the Lorenz cipher. Colossus used thermionic valves to perform Boolean and counting operations. Colossus is thus regarded as the world's first programmable, electronic, digital computer, although it was programmed by switches and plugs and not by a stored program.
Ultra was the designation adopted by 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 for all such intelligence. The name arose because the intelligence obtained was considered more important than that designated by the highest British security classification then used and so was regarded as being Ultra secret. Several other cryptonyms had been used for such intelligence.
Verney Junction is a hamlet in the parish of Middle Claydon in north Buckinghamshire, England. It is on the route of the former Varsity Line..
Bletchley is a constituent town of Milton Keynes, Buckinghamshire, England. It is situated in the south-west of Milton Keynes, and is split between the civil parishes of Bletchley and Fenny Stratford and West Bletchley.
The known-plaintext attack (KPA) is an attack model for cryptanalysis where the attacker has access to both the plaintext, 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:
A plain language passage of any length, usually obtained by solving one or more cipher or code messages, and occurring or believed likely to occur in a different cipher or code message, which it may provide a means of solving.
Cryptography was used extensively during World War II, with a plethora of code and cipher systems fielded by the nations involved. In addition, the theoretical and practical aspects of cryptanalysis, or codebreaking, were much advanced.
Sir Francis Harry Hinsley OBE was an English historian and cryptanalyst. 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.
Woburn Sands railway station serves the town of Woburn Sands and the village of Wavendon in the Borough of Milton Keynes in Buckinghamshire, England. The station is on the Marston Vale line between Bedford and Bletchley, about 4 miles (6.5 km) east of Bletchley station. The station is served by local trains to Bletchley and Bedford using Class 230/1 multiple units. This station is one of the six stations serving the Milton Keynes urban area.
Bedford St Johns is one of two railway stations in Bedford in Bedfordshire, England, on the Marston Vale Line linking Bletchley and Bedford. It is unstaffed and is operated by London Northwestern Railway.
Fenny Stratford is a railway station that serves the Fenny Stratford area of Milton Keynes, Buckinghamshire. It is on the Marston Vale Line that links Bletchley and Bedford, about one mile east of Bletchley railway station.
Bletchley is a railway station that serves the southern parts of Milton Keynes, England, and the north-eastern parts of Aylesbury Vale. It is 47 miles (75 km) northwest of Euston, about 32 miles (51 km) east of Oxford and 17 miles (27 km) west of Bedford, and is one of the six railway stations serving the Milton Keynes urban area.
The Varsity Line was the main railway route that once linked the English university cities of Oxford and Cambridge, operated by the London and North Western Railway.
West Bletchley is a district and civil parish that covers the western part of Bletchley, a constituent town of Milton Keynes in Buckinghamshire, England. The parish includes part of Bletchley which is south of Standing Way (A421), west of the West Coast Main Line, and north of Water Eaton Brook..
Bletchley and Fenny Stratford is a civil parish with a town council, in Milton Keynes, Buckinghamshire, England. It was formed in 2001 from the unparished area of Milton Keynes, and according to the 2011 census had a population of 15,313. Together with West Bletchley, it forms the Bletchley built-up area.
Bletchley TMD is a railway traction maintenance depot situated in Bletchley, Milton Keynes in Buckinghamshire, to the north east of Bletchley railway station, on a siding off the Marston Vale line. The depot is operated by London Northwestern Railway. The depot code is BY but, in steam days, the shed code was 1E.
MK Metro was a bus company operating in Milton Keynes from 1997 until 2010.
East West Rail is a major project to establish a strategic railway connecting East Anglia with Central, Southern and Western England. In particular, it plans to build a line linking Oxford and Cambridge via Bicester, Milton Keynes and Bedford, largely using the trackbed of the former Varsity Line. Thus it provides a route between any or all of the Great Western, Chiltern, West Coast, Midland, East Coast, West Anglia and Great Eastern main lines, avoiding London. The new line will provide a route for potential new services between Southampton Central and Ipswich or Norwich via Reading, Didcot and Ely, using existing onward lines. The Government approved the western section in November 2011, with completion of this section expected by 2025. As of January 2019, the Company aims to complete the Central section by "the mid 2020s". As of March 2020, electrification of the line is not planned, but the 2019 decision is under review. The plan is divided into three sections:
The Bletchley Flyover is a reinforced concrete railway viaduct that carried the former Varsity line over the West Coast Main Line in Bletchley, England. It was retained when the line closed and, as of July 2020, is being restored for use in East West Rail.