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Describe the origin, use, influence, and mechanics of a code or cipher of your choice. Your response should be between 1000 and 1500 words. Be sure to interest your reader in your chosen code or cipher and explain the mechanics of your code or cipher (enciphering, deciphering, and decryption) in ways your reader can understand. Be clear, precise, and concise. And cite your sources.

Title: The Enigma Machine: An Ingenious Cipher that Shaped World History

The Enigma machine, a fascinating cipher device, played a pivotal role in World War II. Its origin, use, influence, and mechanics offer a captivating glimpse into the world of cryptography and its impact on global events.


The Enigma machine was invented by a German engineer, Arthur Scherbius, in the aftermath of World War I. Scherbius aimed to create a device that could provide secure communication, a critical need in a world increasingly reliant on telegraph and radio transmissions. The Enigma machine was patented in 1918 and initially marketed for commercial use. However, its potential for military application was soon recognized, and by the early 1930s, it was adopted by the German military and other entities for secure communication (Kahn, 1996).


The Enigma machine was essentially a cipher device used to encrypt and decrypt secret messages. It was widely used by German forces during World War II for communication between units and command centers. The machine transformed plain text messages into cipher text, which could then be transmitted via morse code or other means without fear of interception. The recipient, equipped with an Enigma machine set with the same settings as the sender's, could then decrypt the message.


The Enigma machine had a profound influence on the course of World War II. The Germans believed the Enigma encryption to be unbreakable, which led them to use it extensively. However, the code was eventually broken by the Allies, led by British cryptanalysts at Bletchley Park. The intelligence gained from deciphering Enigma-encrypted messages, codenamed Ultra, provided the Allies with invaluable insights into German strategies and plans. Many historians argue that the breaking of the Enigma code significantly shortened the war and saved countless lives (Hinsley, 1996).


The Enigma machine's mechanics were both ingenious and complex. The machine resembled a typewriter and included a keyboard for input and a lampboard for output. The core of the machine was a set of rotating mechanical rotors, which scrambled the input to produce the cipher text.

When a key was pressed, an electrical signal would pass through the rotors, each of which would shift the signal to a different letter. This signal would then be reflected back through the rotors by a 'reflector', further scrambling the letter. The resulting letter would light up on the lampboard, providing the encrypted output. Each key press also caused at least one rotor to rotate, changing the electrical pathway and ensuring that the same plain text letter would be encrypted differently each time it was entered (Singh, 1999).

Deciphering the message required an Enigma machine with the same rotor and reflector settings as the original. When the cipher text was entered, it would pass through the rotors and reflector in reverse, producing the original plain text.


The decryption of the Enigma code was a monumental task. The machine's settings offered approximately 158 quintillion possible configurations, making a brute force approach infeasible. The breakthrough came when Polish cryptanalysts, led by Marian Rejewski, discovered that the Germans were using a predictable pattern in their message keys. This, combined with captured Enigma codebooks, allowed the Poles to reverse-engineer the machine and develop methods for decryption (Kozaczuk, 1984).

The work was later continued by the British at Bletchley Park, where a team led by Alan Turing developed the Bombe, a machine that automated the decryption process. The Bombe exploited a feature of the Enigma machine: no letter could be enciphered as itself. By checking for possible rotor settings that could produce a given piece of cipher text, the Bombe could rapidly eliminate incorrect settings and identify the correct ones (Copeland, 2006).


The Enigma machine stands as a testament to the power and influence of cryptography. Its complex mechanics and the efforts to break its code highlight the ongoing battle between code makers and code breakers. The story of the Enigma machine serves as a reminder of the critical role that information security plays in shaping world events.


  • Copeland, B. (Ed.). (2006). Alan Turing's Automatic Computing Engine. Oxford University Press.
  • Hinsley, F. H. (1996). Codebreaking and Signals Intelligence. Intelligence and National Security.
  • Kahn, D. (1996). The Codebreakers. Scribner.
  • Kozaczuk, W. (1984). Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two. University Publications of America.
  • Singh, S. (1999). The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography. Anchor.