Welcome folks today in this blog post we will be encoding or encrypt strings and also decode or decrypt strings in tkinter. All the full source code of the application is given below.

Get Started

In order to get started we need to install the following library using the pip command as shown below

pip install tkinter

Now make an app.py file and copy paste the following code as shown below

app.py

# import tkinter module 
from tkinter import *

# import other necessery 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()

Now if you run this python script by typing the below command as shown below

python app.py