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The name of the code was JN-25. The code was named by the Americans. The "JN" simply designated "Japan". The "25" designated the 25th version of a code. The JN-25 code was the code in use prior to the Battle of the Coral Sea in early 1942 as well as through and including the Battle of Midway in June of 1942. Japan changed their codes to JN-26 in August of 1942 (following their post-mortum after the Battle of Midway), which the code breakers at station HYPO (in Hawaii at Pearl Harbor) began to decode immediately, but took over eight weeks before they were at a 10% sucess rate (1 out of every 10 words). Code breakers did not conentrate strictly on Japan. They also worked on the codes of the Soviet Union, Gernamy, England and Italy as well. You notice that they worked on breaking the codes of foes as well as friends in an effort to gain as much knowledge as possible.

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Q: What was the Japanese code the US intercepted during Midway?
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Related questions

What was won by the US after they broke the Japanese secret code during ww2?

Battle of Midway


Which nation was defeated at the Battle of Midway after its plans of attack were intercepted communications and code breaking?

Japan


What was station HYPO?

The US Navy Communications signal intelligence station at Honolulu, Hawaii called OP-20-02 that intercepted the Japanese naval code JN-25 with invasion plans of Midway Island


What was the key to the American success at midway?

breaking the Japanese Navy's secret code.


How was the Japanese attack at Midway foiled?

The Japanese had planned a surprise attack on Midway. The surprise was foiled because the US had broken Japan's military code and the US was prepared for the attack.


What was the key to the American victory in the Battle of Midway?

breaking the Japanese Navy's secret code.


How did Nimitz know about Japanese intentions at the Battle of Midway?

The United States had broken the Japanese naval code and was able to read a significant part of the messages to give him a good idea of Japanese intentions. However, because other senior commanders believed the target identified as 'AF' in the Japanese messages could have very well meant Hawaii or the West Coast, Nimitz had to prove that the target was indeed Midway. To do this, he ordered a message sent to Midway via underwater cable instructing them to broadcast, in the clear, that their water distillation plant had broken down. Within several days, a Japanese message was intercepted advising that 'AF' was running short of fresh water.


What is the name of the American code breaking machine during the Battle of Midway?

Magic


What was the key tho the American success at midway?

"Magic". This was the cover name given to the US effort at signals interception and decrypting Japanese coded radio messages. Through this the US knew of Japan's plan to attack Midway. The Japanese always used very complicated plans, and Midway was no exception. The Japanese appeared to be moving on three objectives at the same time - but which was the real one? The Japanese did capture two islands in the Aleutians, off Alaska, as one of the Midway diversions. The US had only three aircraft carriers in the Pacific. Because of the success of "Magic" the US Navy was able to have these in position to intercept the attacking Japanese fleet at Midway. The rest was accomplished through bravery, skill, daring, and some very good luck.


What knowledge did the US have that influenced the outcome of the Battle of the Midway?

The Japaneses naval code was broken by the allies, and imminent attack plans by the Japanese was decoded by the allies.


How did the battle at midway help the us?

At Midway, the US Fleet was able to use its advantage in code breaking to ambush the Japanese as they attacked Midway, hoping to draw the American carriers into an uneven battle. Instead, the Americans were able to sink all four of the Japanese carriers with the loss of only one of its own. This shifted the balance of power permanently to the American side for the remainder of the war.


Was Laurence Safford instrumental in breaking the Japanese code?

Laurence F. Safford, along with Joseph J. Rochefort, Jr. were instrumental to breaking the Japanese Code, leading to Japan's defeat at the Battle of Midway. Richard V. Horrell WW 2 Connections.com