Python | Message Encode-Decode using Tkinter

Prerequisite : Basics of Tkinter
Python offers multiple options for developing GUI (Graphical User Interface). Out of all the GUI methods, tkinter is most commonly used method. It is a standard Python interface to the Tk GUI toolkit shipped with Python. Python with tkinter outputs the fastest and easiest way to create the GUI applications. 
Python provides the Tkinter toolkit to develop GUI applications. Now, it’s upto the imagination or necessity of developer, what he/she want to develop using this toolkit. Let’s try to implement a message encryption-decryption application according to the Vigenère cipher, which can encrypt the message using the key and can decrypt the encrypted hash using same key.

Modules used in the project :

Tkinter  -> GUI toolkittime datetime  base64   -> Vigenère cipher

Below is the implementation of above idea : 

Python3

# import tkinter module
from tkinter import *

# import other necessary modules
import random
import time
import datetime

# creating root object
root = Tk()

# defining size of window
root.geometry("1200x6000")

# setting up the title of window
root.title("Message Encryption and Decryption")

Tops = Frame(root, width = 1600, relief = SUNKEN)
Tops.pack(side = TOP)

f1 = Frame(root, width = 800, height = 700,
                            relief = SUNKEN)
f1.pack(side = LEFT)

# ==============================================
#                  TIME
# ==============================================
localtime = time.asctime(time.localtime(time.time()))

lblInfo = Label(Tops, font = ('helvetica', 50, 'bold'),
          text = "SECRET MESSAGING \n Vigenère cipher",
                     fg = "Black", bd = 10, anchor='w')

lblInfo.grid(row = 0, column = 0)

lblInfo = Label(Tops, font=('arial', 20, 'bold'),
             text = localtime, fg = "Steel Blue",
                           bd = 10, anchor = 'w')

lblInfo.grid(row = 1, column = 0)

rand = StringVar()
Msg = StringVar()
key = StringVar()
mode = StringVar()
Result = StringVar()

# exit function
def qExit():
    root.destroy()

# Function to reset the window
def Reset():
    rand.set("")
    Msg.set("")
    key.set("")
    mode.set("")
    Result.set("")


# reference
lblReference = Label(f1, font = ('arial', 16, 'bold'),
                text = "Name:", bd = 16, anchor = "w")

lblReference.grid(row = 0, column = 0)

txtReference = Entry(f1, font = ('arial', 16, 'bold'),
               textvariable = rand, bd = 10, insertwidth = 4,
                        bg = "powder blue", justify = 'right')

txtReference.grid(row = 0, column = 1)

# labels
lblMsg = Label(f1, font = ('arial', 16, 'bold'),
         text = "MESSAGE", bd = 16, anchor = "w")

lblMsg.grid(row = 1, column = 0)

txtMsg = Entry(f1, font = ('arial', 16, 'bold'),
         textvariable = Msg, bd = 10, insertwidth = 4,
                bg = "powder blue", justify = 'right')

txtMsg.grid(row = 1, column = 1)

lblkey = Label(f1, font = ('arial', 16, 'bold'),
            text = "KEY", bd = 16, anchor = "w")

lblkey.grid(row = 2, column = 0)

txtkey = Entry(f1, font = ('arial', 16, 'bold'),
         textvariable = key, bd = 10, insertwidth = 4,
                bg = "powder blue", justify = 'right')

txtkey.grid(row = 2, column = 1)

lblmode = Label(f1, font = ('arial', 16, 'bold'),
          text = "MODE(e for encrypt, d for decrypt)",
                                bd = 16, anchor = "w")

lblmode.grid(row = 3, column = 0)

txtmode = Entry(f1, font = ('arial', 16, 'bold'),
          textvariable = mode, bd = 10, insertwidth = 4,
                  bg = "powder blue", justify = 'right')

txtmode.grid(row = 3, column = 1)

lblService = Label(f1, font = ('arial', 16, 'bold'),
             text = "The Result-", bd = 16, anchor = "w")

lblService.grid(row = 2, column = 2)

txtService = Entry(f1, font = ('arial', 16, 'bold'),
             textvariable = Result, bd = 10, insertwidth = 4,
                       bg = "powder blue", justify = 'right')

txtService.grid(row = 2, column = 3)

# Vigenère cipher
import base64

# Function to encode
def encode(key, clear):
    enc = []

    for i in range(len(clear)):
        key_c = key[i % len(key)]
        enc_c = chr((ord(clear[i]) +
                     ord(key_c)) % 256)

        enc.append(enc_c)

    return base64.urlsafe_b64encode("".join(enc).encode()).decode()

# Function to decode
def decode(key, enc):
    dec = []

    enc = base64.urlsafe_b64decode(enc).decode()
    for i in range(len(enc)):
        key_c = key[i % len(key)]
        dec_c = chr((256 + ord(enc[i]) -
                           ord(key_c)) % 256)

        dec.append(dec_c)
    return "".join(dec)


def Ref():
    print("Message= ", (Msg.get()))

    clear = Msg.get()
    k = key.get()
    m = mode.get()

    if (m == 'e'):
        Result.set(encode(k, clear))
    else:
        Result.set(decode(k, clear))

# Show message button
btnTotal = Button(f1, padx = 16, pady = 8, bd = 16, fg = "black",
                        font = ('arial', 16, 'bold'), width = 10,
                       text = "Show Message", bg = "powder blue",
                         command = Ref).grid(row = 7, column = 1)

# Reset button
btnReset = Button(f1, padx = 16, pady = 8, bd = 16,
                  fg = "black", font = ('arial', 16, 'bold'),
                    width = 10, text = "Reset", bg = "green",
                   command = Reset).grid(row = 7, column = 2)

# Exit button
btnExit = Button(f1, padx = 16, pady = 8, bd = 16,
                 fg = "black", font = ('arial', 16, 'bold'),
                      width = 10, text = "Exit", bg = "red",
                  command = qExit).grid(row = 7, column = 3)

# keeps window alive
root.mainloop()

Output :
Encrypt Window – 

Decrypt Window –