aes-128-decryption.py

#!/usr/bin/env python3
from Crypto.Cipher import AES
import os
import time

key = os.urandom(16)
iv = os.urandom(16)
# Create an AES-128 cipher object with the key and IV
cipher = AES.new(key, AES.MODE_CBC, iv)

size_handling = [100000,500000,1000000,5000000,10000000]
# Measure the time taken to encrypt encrypted_messages of increasing size
for i in size_handling:
    encrypted_message = b'\x95lxk\xb5\xd8\xb7b9l\x153\x83}v\xceLT6U\xd6<\xf3\x92&\xb9P\x8a\x0f\xa1\xc9\x90+0\xb3zC\xbf\xa0\x89\xbf\xbb\xb5\xa8\x801c\x8d' * i

    initial_time = time.time() 
    plaintext = cipher.decrypt(encrypted_message) #decrypts message
    end_time = time.time() 
    total_time = end_time - initial_time #total time taken to decrypt

    print(f"time taken for encrypted message to decrypt * {i} bytes: {total_time} seconds")