Elizebeth Friedman, a pioneering cryptographer, played a crucial role in U.S. intelligence during World War II. She cracked ...

This four-wheel Enigma machine was used by the German forces during the second world war to send coded messages. Many machines of this type were used on the U-Boat submarines sent out to disrupt ...

(SSPL/Getty Images) Peter Westcombe, founder of the Bletchley Park Trust, explains in detail how the Enigma machine works and how its codes were broken by the code-breakers at Bletchley Park.