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During the recent visit to the U.K., the Queen gave President Trump the special edition of Winston Churchill’s memoirs “The Second World War”. The secret that Churchill was forced to keep by intelligence authorities is that throughout the War he had access to ULTRA. 
ULTRA intelligence was obtained by the British codebreakers during WWII. By cracking ENIGMA codes, they received access to high-level German communications.
Churchill became PM on 10 May 1940. 12 days later, codebreakers at Bletchley Park, England, broke the Enigma key used by the German Air Force. This was the first major success for British intelligence in #WWII.
The introduction of mechanical encoding machines started a new battle between code-makers and code-breakers. The German military used ENIGMA machines in WWII to encrypt their communications. The machine generated random letters. If used correctly, it produced an unbreakable code.
