# Import the cryptography module
from cryptography.fernet import Fernet

# Generate a new encryption key
key = Fernet.generate_key()

# Define the original message to be encrypted
message = "Hello, world!"

# Encrypt the message using the Fernet algorithm and the generated key
fernet = Fernet(key)
encrypted_message = fernet.encrypt(message.encode('utf-8'))

# Print the resulting encrypted message
print(encrypted_message)

# Decrypt the encrypted message using the Fernet algorithm and the same key
decrypted_message = fernet.decrypt(encrypted_message)

# Print the resulting decrypted message
print(decrypted_message.decode('utf-8'))