After watching a video on numberphile thought it would be interesting to implement a virtual version on the Enigma cipher machine.

Step 1: Install Scala and Eclipse IDE for Scala.

Step 2: Review the numberphile video and how the Enigma machine works

Step 3: Implement each function of the machine

  1. Rotors
    • Rotor choices, rotors have different circuitry (0-24) – static value for each message
    • Initial rotor combination (0-25) – static value for each message
    • Rotor increment – Faster rotor, middle rotor, slow rotor
  2. Plug board
    • 10 wires
    • swapping 2 letters
    • static value for each message

Step 4: Write an interface between the functions and a basic interface (text?)

Step 5: Test!

Conclusion: Using Scala (trying anyway) the implementation is not very complex. What is more difficult is replicating the original machines where the output character could not equal the input character. The limitation Turing used to crack the machines. Might see if I can implement that later then test out the cracking method. Not sure how easy it would be to break the current implementation…

CODE (EnigmaMachine.scala, EnigmaMachine.class):