Data Encryption Standard (DES)

Implementation of Data Encryption Standard (DES) in Python 3.8.

Supports Electronic Codebook (ECB) and Cipher Block Chaining (CBC) Block Cipher Modes of Operation.

Instructions

Run des.py.

    usage: des.py [-h] {ecb,cbc} ...

    positional arguments:
      {ecb,cbc}
        ecb       use Electronic Codebook (ECB) encryption mode
        cbc       use Cipher Block Chaining (CBC) encryption mode
    
    optional arguments:
      -h, --help  show this help message and exit

    usage: des.py ecb [-h] (-e | -d) key_file infile outfile
    
    positional arguments:
      key_file    text file to be used as key for encryption/decryption
      infile      text file to be used as input for encryption/decryption
      outfile     text file to be used as output for encryption/decryption
    
    optional arguments:
      -h, --help  show this help message and exit
      -e          encrypt
      -d          decrypt

    usage: des.py cbc [-h] (-e | -d) key_file infile outfile iv_file
    
    positional arguments:
      key_file    text file to be used as key for encryption/decryption
      infile      text file to be used as input for encryption/decryption
      outfile     text file to be used as output for encryption/decryption
      iv_file     text file to be used as IV for encryption/decryption
    
    optional arguments:
      -h, --help  show this help message and exit
      -e          encrypt
      -d          decrypt