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The Zimmermann telegram (or Zimmermann note or Zimmermann cable) was a secret diplomatic communication issued from the German Foreign Office on January 17, 1917, that proposed a military contract between the German Empire and Mexico if the United States entered World War I against Germany.
The decoding by British Naval intelligence of the Zimmermann telegram helped bring the United States into the war. Trench codes were used by field armies of most of the combatants (Americans, British, French, German) in World War I. [1] The most commonly used codes were simple substitution ciphers. More important messages generally used ...
Such "two-part" codes required more effort to develop, and twice as much effort to distribute (and discard safely when replaced), but they were harder to break. The Zimmermann Telegram in January 1917 used the German diplomatic "0075" two-part code system which contained upwards of 10,000 phrases and individual words. [3]
Rev. William Montgomery (1871–1930) was a Presbyterian minister and a British codebreaker who worked in Room 40 during World War I.. Montgomery and Nigel de Grey deciphered the Zimmermann Telegram, which helped bring the U.S. into World War I.
Arthur Zimmermann (5 October 1864 – 6 June 1940) was State Secretary for Foreign Affairs of the German Empire from 22 November 1916 until his resignation on 6 August 1917. His name is associated with the Zimmermann Telegram during World War I .
Thus the Zimmermann Telegram triggered the United States' entry into World War I; and Allies reading of Nazi Germany's ciphers shortened World War II, in some evaluations by as much as two years. Until the 1960s, secure cryptography was largely the preserve of governments.
A Hi-res image of the undecoded Zimmerman Telegram, offering what the Imperial German Government called "generous financial support and understanding" to the Mexican government if it would enter the war as an ally of the Central Powers in World War I. Germany had a vested interest in keeping the United States tied down in order to prevent ...
Zimmermann telegram as decoded by Room 40 in 1917. Room 40 played an important role in several naval engagements during the war, notably in detecting major German sorties into the North Sea. The battle of Dogger Bank was won in no small part due to the intercepts that allowed the Navy to position its ships in the right place. "Warned of a new ...