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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 ...
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.
Alfred Dillwyn "Dilly" Knox, CMG (23 July 1884 – 27 February 1943) was an English classics scholar and papyrologist at King's College, Cambridge and a codebreaker.As a member of the Room 40 codebreaking unit he helped decrypt the Zimmermann Telegram which brought the USA into the First World War. [1]
Zimmermann Telegram: Solved within days of transmission 1918 Chaocipher: Solved 1918–1945 Enigma machine messages Solved (broken by Polish and Allied cryptographers between 1932 and 1945) 1939 D'Agapeyeff cipher: Unsolved 1939–1945 Purple cipher machine messages Solved (broken by Allied cryptographers in 1940) 1941 Lorenz SZ42 machine ...
The Zimmermann Telegram was from the German foreign secretary Arthur Zimmermann to the German ambassador Heinrich von Eckardt in Mexico, telling him to offer the Mexican government the return of the states of Arizona, Texas and New Mexico as an inducement to Mexico to side with Germany against the United States.
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.
The Zimmermann Telegram (as it was sent from Washington to Mexico) encrypted as ciphertext. KGB ciphertext found in a hollow nickel in Brooklyn in 1953. In cryptography, ciphertext or cyphertext is the result of encryption performed on plaintext using an algorithm, called a cipher. [1]