3DES.py

#!/usr/bin/env python3
from Crypto.Cipher import DES3
from Crypto.Util.Padding import pad
import os
import time

# generation of keys and iv
key = b'TWENTYFOURBYTEKEY3DES$$$' 
iv = b'IVIVIVIV' 

# Create a 3DES cipher object with the key and IV
cipher = DES3.new(key, DES3.MODE_CBC, iv)

size_handling = [100000, 500000, 1000000, 5000000, 10000000]
# Measure the time taken to encrypt messages of increasing size
for i in size_handling:
    message = b'Which witch switched the Swiss wristwatches?' * i

    t1 = time.time()
    padding = pad(message, DES3.block_size) #additional padding
    ciphertext = cipher.encrypt(message)  # encrypts secret message
    t2 = time.time()
    total_time = t2 - t1  # total time taken to encrypt

    print(f"time taken for secret message * {i} encryption bytes: {total_time} seconds")