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Python - Encryption and Decryption

2 min read

Encryption and Decryption

Code Properties

  • Language: Python
  • Modules: tkinter

Overview

Simple GUI-based encryption tool using letter position swapping. This is a basic cipher for educational purposes.

Code

from tkinter import messagebox, simpledialog, Tk
 
def is_even(number):
    return number % 2 == 0
 
def get_even_letters(message):
    even_letters = []
    for counter in range(0, len(message)):
        if is_even(counter):
            even_letters.append(message[counter])
    return even_letters
 
def get_odd_letters(message):
    odd_letters = []
    for counter in range(0, len(message)):
        if not is_even(counter):
            odd_letters.append(message[counter])
    return odd_letters
 
def swap_letters(message):
    letter_list = []
    if not is_even(len(message)):
        message = message + 'x'
    even_letters = get_even_letters(message)
    odd_letters = get_odd_letters(message)
    for counter in range(0, int(len(message)/2)):
        letter_list.append(odd_letters[counter])
        letter_list.append(even_letters[counter])
    return ''.join(letter_list)
 
def get_task():
    return simpledialog.askstring('Task', 'Do you want to encrypt or decrypt?')
 
def get_message():
    return simpledialog.askstring('Message', 'Enter the secret message: ')
 
root = Tk()
while True:
    task = get_task()
    if task == 'encrypt':
        message = get_message()
        encrypted = swap_letters(message)
        messagebox.showinfo('Ciphertext:', encrypted)
    elif task == 'decrypt':
        message = get_message()
        decrypted = swap_letters(message)
        messagebox.showinfo('Plaintext:', decrypted)
    else:
        break
root.mainloop()

Usage

Run the script and follow the GUI prompts to encrypt or decrypt messages.

Warning

This is a simple educational cipher. For real security, use proper encryption libraries like cryptography.

Appendix

Note created on 2024-04-23 and last modified on 2024-12-31.

See Also

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