Enigma Machine

Introduction

The Enigma machine is a cipher device developed in the early to mid 20th century. It was mostly used by the germans during World War II. More information on Wikipedia: https://en.wikipedia.org/wiki/Enigma_machine

Goal

The goal of this Kata is to recreate the famous Enigma machine in multiple steps and at the end decrypt a secret message which I encrypted while developing and solving this kata on my own.

Code Kata

information on Code Katas http://codekata.com

Disclaimer

This is the first Code Kata I'm designing and this repo is currently work in Progress

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Table of Contents

1. Roadmap
2. Part 1 - The Plugboard
3. Part 2 - One Rotor

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Design Parts

Part 1 - The Plugboard

For the first part of this kata you have to design the plugboard. The plugboard contains all 26 letters and maps one to another.

• The plugboard contains all letters from A to Z
• There is no differentiation between upper and lowercase letters
• Umlauts are not considered Ä -> AE, Ö -> OE, Ü -> UE and ß -> SS
• The plugboard contains a maximum of 10 connections
  • Not all connections have to be used
  • There will be at least 6 unmapped letters left and will be used unchanged
• Each connection is only used once
  • That means A -> B, B -> C is not valid
  • No letter can connect to itself
• Each connection is bidirectional
  • That means A -> B also is B -> A
  • This counts as one connection on the plugboard
• If a configuration or a connection is not legitimate raise an exception

Part 2 - One Rotor

For the second part of this kata you have to design one rotor. A rotor is a disk containig 26 inputs and 26 outputs.