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The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...
This is a list of the officially accredited Battle of Britain units with their aircraft types, code letters, call signs and casualties. On 9 November 1960, the Air Ministry published Air Ministry Order N850 which officially defined the qualifications for aircrew to be classified as having participated in the Battle of Britain.
Eve could use frequency analysis to help solve the message along the following lines: counts of the letters in the cryptogram show that I is the most common single letter, [2] XL most common bigram, and XLI is the most common trigram. e is the most common letter in the English language, th is the most common bigram, and the is the
The Battle of Britain (German: Luftschlacht um England, lit. 'air battle for England') was a military campaign of the Second World War, in which the Royal Air Force (RAF) and the Fleet Air Arm (FAA) of the Royal Navy defended the United Kingdom (UK) against large-scale attacks by Nazi Germany's air force, the Luftwaffe.
This is a list of orders of battle, which list the known military units that were located within the field of operations for a battle or campaign. The battles are listed in chronological order by starting date (or planned start date).
The order continued for some time as a national order of Hanover, until the Kingdom of Hanover’s defeat against Prussia and forced dissolution in 1866. Since then, it has been a house order to be awarded by the House of Hanover. The order's current head is Ernst August Prinz von Hanover, head of the House of Hanover. The Order includes two ...
Sector stations had sector control rooms as well as the usual features of RAF aerodromes; they were able to control RAF fighter formations during the battle. Sector stations were also able to disperse squadrons to satellite aerodromes, most of which were fully equipped. [5] [6]
Various abbreviations are in use, including OOB, O/B, or OB, while ORBAT remains the most common in the United Kingdom. An order of battle is distinct from a table of organisation, which is the intended composition of a given unit or formation according to the military doctrine of its armed force. Historically, an order of battle was the order ...