Group Project - Encrypter, Decrypter and Cracker Tool

Ciphers implemented

• Caesar cypher - Smart crack;
• Simple Substitution - Quadgram Hill climb and frequency analysis;
• Vigenere cypher - Period analysis;
• Feistel cypher (No Crack);
• Massey-Omura;
• R.S.A. - FactorDB, Fermat's Factorization, and Brute force from primes saved in txt file;
• ElGamal

How to use

Note: You must be running atleast Python 3.10 - otherwise the 'match' statements will throw syntax errors

Install libraries:
pip install -r requirements.txt

usage: main.py [-h] [--encrypt] [--decrypt] [--crack] [--generate] {caesar,rsa,elgamal,massey,simple,feistel,vigenere} ...

Encrypt, decrypt or crack a cipher text.

options:
  -h, --help            show this help message and exit

cipher:
  {caesar,rsa,elgamal,massey,simple,feistel,vigenere}
                        Cipher types - rsa, caesar, simple, feistel
    caesar              Caesar Cipher
    rsa                 RSA Cipher
    elgamal             El Gamal Cryptosystem
    massey              Massey-Omura cryptosystem
    simple              Simple Substitution Cipher
    feistel             Feistel Cipher
    vigenere            Vigenere Cipher

action:
  --encrypt, -e         Encrypt the plain text
  --decrypt, -d         Decrypt the cipher text
  --crack, -c           Crack the cipher text
  --generate, -g        Generate a key

Current system usage:
python main.py -h

Feistel Cipher example:
python main.py --encrypt feistel -t test -k abc -r 10

Caesar Cipher example:
python main.py --encrypt caesar -t test -s 3

Simple Cipher example:
python main.py --encrypt simple -t -k abcdefghijklmnopqrstuv (Key must be 26 letters)

Vigenere Cipher example:
python main.py --encrypt vigenere -t test -k cars

RSA Cipher example:
python main.py --encrypt rsa -t 95 -n 58687709 -e 270679

Massey Omura Cipher example:
python main.py --encrypt massey -t 104 -p 3433 -a 1697 -b 31

El Gamal Cipher example:
python main.py --encrypt elgamal -t 42 -k 1343 -y 1828 -a 30 -p 13757