As technology evolves, so do the methods of encryption and decryption available to us. World War II saw the use of a wide variety of codes, from substitution ciphers to the use of Navajo code talkers in the Pacific. Here, science journalist and author Simon Singh demonstrates the German Enigma machine, a typewriter-like device for encrypting messages. He shows not only how it works, but also the strengths and serious flaws of its method.

Watch the full program here: https://youtu.be/nVVF8dgKC38
Original program date: June 4, 2011

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