The Magic Decoding Machines In WWII

During the Pacific portion of World War II, increasingly frequent instances of broken codes plagued the United States Marine Corps. Because the Japanese had become adept code breakers, at one point a code based on a mathematical algorithm could not be considered secure for more than 24 hours. Desperate for an answer to the apparent problem, the Marines decided to implement a non-mathematical code; they turned to Philip Johnston's concept of using a coded Navajo language for transmissions.

Next, Toland proves that not only were vital messages not passed on to the people who could have lessened or halted the attack on Pearl Harbor completely, these messages were kept from the investigators. Charles Rugg, Kimmel’s chief counsel,

The code obviously had to be a really good one considering the risk and people depending on the outcome of this war. According to “Code talker tells his story Achieve3000” The japanese were never able to “break the code”. This was vital to the success and outcome of the war because if they did crack the code the japanese could have completely held the fate of the war in the palm of their hands. One other thing that made the code so hard to crack was in the language Navajo which was a language usually not even allowed to be spoken! In the boarding camp Nez went to they would get soap in there mouths for speaking it, ewww!

After the Japanese attacked Pearl Harbor on Dec 7, 1941, the United States found themselves in a war in the Pacific with Japan. The United States was in a serious situation because many Japanese soldiers were educated in both high schools and colleges in the U.S. These soldiers would intercept and decode American military communications. The United States needed to develop an unbreakable code to communicate plans and orders.

On the Japanese side of intelligence, Yamamoto believed to have the element of surprise at Midway, which was thought to draw the Americans out of Pearl Harbor. Yamamoto had numerical naval superiority in the Pacific to defeat the Americans at sea but remained unaware that the code breakers ascertained its operational and strategic plan to attack at Midway. Spector argues that Japanese submarines knew the American forces were planning something at Pearl Harbor, but the intelligence was never passed on to Yamamoto. Additionally, Yamamoto believed that two of the American carriers were sunk at Coral Sea, which the Yorktown was hastily being repaired in Pearl Harbor. In reality, the Japanese had no idea where the American fleet or carriers were leading up to the Battle of Midway.

Yamamoto had a complex invasion plan that included a second operation against the Aleutian Islands near Alaska, however, because of the damages sustained at the Battle of Coral Sea, his Carrier Strike Force consisted of only four aircraft carriers defended by only a handful of cruisers and destroyers (“HIGH NOON ON THE HIGH SEAS”). Even with the depleted fleet, the Japanese remained confident that the upcoming battle would be a swift victory for their advancement into the Pacific. Little did the Japanese know that U.S Intelligence was hard at work gathering intel to thwart an offensive on Midway.

A series of Japanese codes broken by the U.S. Crytologist in 1920 revealed the country preparation for war, after decoding another of message that orders a ship to be position in Pearl Harbor (Glick). Before the raid Britain had broken Japanese codes and had key clues (Glick). They broke Japan’s diplomatic code; American officials knew about the Japan’s Embassy order to destroy its codes machines (Pearl Harbor). On October 9, 1941 the War Department decoded a Tokyo-to-Honolulu dispatch instructing the consul General to divide Pearl Harbor into five areas and to tell the exact location of American ship in that area (Perloff). The Dutch army decoded a dispatch forecasting attacks on four areas including Hawaii (Perloff). There were a lot of different Japanese codes that were cracked, warning of the Japanese going to attack on Pearl Harbor.

On November 26, 1941, the Japanese Task Force comprised of six aircraft carriers. A support force, which included two battleships, three cruisers, nine destroyers, three submarines, escorted it and eight oil supply ships, began their trek to Hawaii. They must travel four thousand miles across open sea and remain undetected by the UNITED STATES Forces. (Wisniewski 20) The UNITED STATES Military knew a surprise attack by Japan was possible and they thought they were prepared. Adm. Husband E. Kimmel and Lt. Gen. Walter C. Short, the commanders of the UNITED STATES Naval and Army forces in Hawaii, respectively, had regularly scheduled training exercises and had taken many precautions to avert disaster. (Pearl Harbor’s History, Filmstrip)

By the early morning of December 7, 1941 the Japanese Naval force led by Admiral Nagumo had parked his fleet of 6 aircraft carriers 230 nautical miles off the north coast of the Hawaiian Islands completely undetected. The fleet had approximately 423 aircraft with a final destination of Pearl Harbor. At 600 a.m. the first wave of 180 aircraft were launch to attach the sleeping Hawaiian bay. At 702 a.m. an Army radar station sights the aircraft inbound and report to their direct officer who is aware of a squadron of B-17’s due in from the west coast and write off the sighting am friendly forces. This was the first of many mistakes that would become evident within the hour.

"In very exceptional cases, they made no mention of their plans or movements to any of their embassies, so that, in these instances, there were no codes to decipher. The attack on Pearl Harbour was such a case" (Ford,

Prior to the upcoming Coral Sea battle, a number of Japanese military messages had been intercepted by the U.S. Navy signals intelligence unit. The first, dated March 28, 1942, was encoded as stating “The objective of MO will be first to restrict the enemy fleet movements and will be accomplished by means of attacks on the north coast of Australia.” (“Battle of the Coral Sea”) Subsequent messages were intercepted that provided allied forces with updated details concerning IJN fleet progress, as well as elements of IJN plans that included battleship and carrier logistics. This resulted in the U.S. Navy’s deployment of a cotillion of numerous warships and support craft, and also the carriers Lexington and Yorktown (“Battle of the Coral Seas”). In the upcoming battle, these ships would do battle against a superior IJN force comprised of far more battleships, submarines and support craft, as well as aircraft carriers.

“Yesterday, December 7th, 1941 -- a date which will live in infamy -- the United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan…It will be recorded that the distance of Hawaii from Japan makes it obvious that the attack was deliberately planned many days or even weeks ago. During the intervening time, the Japanese government has deliberately sought to deceive the United States by false statements and expressions of hope for continued peace.” (Senate Document No. 148) This speech would echo through history as the moment the United States officially entered the most costly five year period in all of human history. President Roosevelt continued stating multiple islands and American

Code breakers at HYPO were able to intercept and decipher enough Japanese transmissions to learn that an invasion was being planned, but the question was where. There were only two clues: AF and the United States were operating extensive air searches from the location. Nimitz believed that the island of Midway was the only place, near Hawaii, that the Japanese could be planning to advance on and ordered an increase of military presence on both the island and in surrounding waters. Admiral King, still not impressed with Nimitz or with Pearl Harbor HYPO intelligence, believed AF could be anywhere. HYPO, with permission, came up with a plan: send a transmission from Midway to Pearl Harbor saying that the water desalination equipment was broken and there was a major shortage of water on the island. The following day a Japanese transmission was decoded: there was a water shortage at attack location and to add water desalination equipment as a target.

In January 1941, reports were received that Japan might attack Pearl Harbor but military officials ignored these reports. They considered attacks on the Philippines and other European countries to be more likely, underestimating Japan’s ability to conceal preparations for such an operation. Due to the success of the cryptanalysis machine called, Magic, American leaders started breaking Japanese military operational codes. The codes that were deciphered showed Japan was likely to take some type of military action (Irive). At that time, Japan had only a 12-month supply of petroleum to fuel its economy and war operations left. So the U.S. anticipated Japan would act quickly! The only questions that could not be answered were when and where (Woods). Pearl Harbor had been a major naval base since before 1898. In early

The radio is one of the most influential pieces of technology ever invented. From political debates to Taylor Swift’s latest hit, with the help of the radio, society stays informed on a plethora of topics. Freddie Mercury wasn’t lying when he said, “and everything I had to know, I learned it on my radio.” In almost every country in the world, there is at least one radio station used to broadcast news to it’s people. Since the creation of the FM radio, it has been used to reach out to people over a certain area and keep them informed about the society they live in. During the 1930s and the 1940s, the radio played a very important role in history; it was a tool used during World War II by America, Great Britain, and Nazi Germany. By sending