Enigma

A simple implementation of the enigma cipher machine in C++

Introduction

The Enigma machine was used by the Germans in Word War II (WW2) to encrypt their secret messages. Enigma was invented by the German engineer Arthur Scherbius. It works by using an electrical circuit with simple buttons for the keys and lamps for indicators. It also uses a set of three rotors for changing the encryption algorithm every time a key is pressed.

This implementation

This implementation is not focused on fast encryption of words / sentences. It rather uses single commands to enter key after key. You can also check the setting of a rotor at every time. This gives you full control over what happens and how it works. Note that as in the original Enigma machine, this program will ignore spaces and capitalised letters. This implementation is the Enigma machine is written in C++. This repository has a easy/beginner-friendly documentation. Enjoy 😃

Build

Dependencies

• gcc (g++) Use MinGw on Windows
• CMake
• git (Optional)

Build on Linux

1. Clone the repository from github or download via the "Download ZIP" Button

$ git clone https://github.com/Zattstudio/Enigma.git

2. Navigate into the directory

$ cd Enigma

or if you downloaded it as a zip (after extraction)

$ cd Enigma-master

3. Generate CMake project files

$ cmake .

4. Build project

$ make

5. Execute

$ ./Enigma

Usage

Once you've successfully run the project, you'll be prompted with a welcome message. From here you can set up the configuration for your rotors or start entering keystrokes directly.

Commands

Command	Parameters	Example	Description
Insert Key	Key(letter)	:IK 'A'	This Command inserts a key into the algorithm. This is the equivalent to pressing a key on the device.
Quit	-	:Q	This will Quit the program
Clear	-	:CLEAR	This command will clear all your
Print State	-	:PR	Print the current state/setting of the rotors
Set Rotor	rotor(0-2) state(0-25)	:SETR 1 14	Sets the state of the selected rotor to a custom value

Change rotor configuration (wiring)

The configuration of rotors is not (yet) configurable from the instruction line or a configuration file. To change the wiring of a rotor, open the project in a text-editor of your choice and open the RotorScramble.h file. Change the numbers in vectors with the names rotorScramble + {1,2,3} to your configuration. The numbers range from 0 to 25. This results in the first number of your array being mapped to 0 and so on. Once you're done with setting up, you have to recompile the project. For that follow the topic Build from step 4.