Briefly describe Enigma.

What will be an ideal response?

Possibly the most famous substitution cryptography machine was Enigma, the most secure encryption method of its time. Enigma worked similarly to a mechanical word processor, in that it could be configured to print a substitute character for the character typed. During World War II, the German Army used this machine to send commands and orders from headquarters to the battle lines. The recipient would use an identical machine set up with the proper configuration to decrypt the messages. Using information from Nazi defectors and from errors in some coded German documents, Alan Turing, a member of the British government's Code and Cypher School at Bletchley Park, developed the Turing Bombe, a machine to crack the "Enigma Code."