app.py

import os
from cryptography.fernet import Fernet

# Get the key securely
key = os.getenv("DECRYPTION_KEY")
fernet = Fernet(key.encode())

# Read encrypted file
with open("encrypted_code.bin", "rb") as f:
    encrypted_code = f.read()

# Decrypt and run
exec(fernet.decrypt(encrypted_code).decode())