How World War II codebreakers contributed to allied victory.

Breaking the Japanese code JN25 following Pearl Harbor allows the U.S. Navy to position itself for victory at Midway.

The British and U.S. strategy of exploiting cryptographers' personal natures in order to break their codes.

Cracking Japanese codes; Japan develops a code-making machine.

The beginning of modern code-breaking following the creation of a special unit by the British Royal Navy in 1914.