Embedded Files
Project Overview
Project Overview
Modeling the Enigma machines used by Germany during World War II to encrypt military communications, we were tasked to build a program that takes in possible initial configurations and encode or decode messages.
Modeling the Enigma machines used by Germany during World War II to encrypt military communications, we were tasked to build a program that takes in possible initial configurations and encode or decode messages.
How it Works
How it Works
The Enigma machine is an encrypting machine that is set up with different rotor disks which have alphabets on them, and the user can enter messages to encrypt or decrypt them.
The Enigma machine is an encrypting machine that is set up with different rotor disks which have alphabets on them, and the user can enter messages to encrypt or decrypt them.
In general, our program takes in a configuration file, and optionally, an input file and output file. For example, the German Navy's Enigma machine is below.
In general, our program takes in a configuration file, and optionally, an input file and output file. For example, the German Navy's Enigma machine is below.
The corresponding configuration file is below. The first line describes the alphabet that the machine uses. The number 5 describes how many rotors are to be put in each time, and the number 3 describes how many moving rotors. The rest describes the names of rotors (I through C) that can be put in the machine.
The corresponding configuration file is below. The first line describes the alphabet that the machine uses. The number 5 describes how many rotors are to be put in each time, and the number 3 describes how many moving rotors. The rest describes the names of rotors (I through C) that can be put in the machine.
Rotors with the letters M after their name are moving rotors, and are to be placed last
Rotors with the letters N are non-moving rotors, and are to be placed after reflector rotors
Rotors with the letters R are reflectors, and are to be put in first. There should only be one reflector.
The rest of the descriptions are called "Permutations," and they describe how each rotor maps a certain letter to another. For example, rotor I maps A to E, and U back to A.
The rest of the descriptions are called "Permutations," and they describe how each rotor maps a certain letter to another. For example, rotor I maps A to E, and U back to A.
Using the Machine
Using the Machine
Download "proj1.zip"* and unzip the file. Then, navigate to the "proj1" folder with your terminal. For simplicity, run the command "java -ea enigma.Main default.conf" to load the Germany Navy configuration file.
Download "proj1.zip"* and unzip the file. Then, navigate to the "proj1" folder with your terminal. For simplicity, run the command "java -ea enigma.Main default.conf" to load the Germany Navy configuration file.
Afterwards, input the command "* B Beta III IV I AXLE (YF) (ZH) " to put in reflector B, non-moving rotor Beta, and moving rotors III, IV, I. The AXLE is to turn the rotors to those settings, and the (YF) and (ZH) are further plugboard configurations on the enigma machine to encrypt and decrypt the message.
Afterwards, input the command "* B Beta III IV I AXLE (YF) (ZH) " to put in reflector B, non-moving rotor Beta, and moving rotors III, IV, I. The AXLE is to turn the rotors to those settings, and the (YF) and (ZH) are further plugboard configurations on the enigma machine to encrypt and decrypt the message.
After running the settings command above, type in a message in all caps, and out comes an encrypted message. To decrypt the message, another user must enter the exact same settings and configurations. To test this, run the settings commands again, and enter the outputted message.
After running the settings command above, type in a message in all caps, and out comes an encrypted message. To decrypt the message, another user must enter the exact same settings and configurations. To test this, run the settings commands again, and enter the outputted message.
*Due to instructional confidentiality, I may only privately share my code for employment purposes.
Sample
Sample
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