import os
import base64

def generate_random_passphrase(length=16):
    """
    Generate a random passphrase encoded in ASCII.
    """
    random_bytes = os.urandom(length)
    passphrase = base64.b64encode(random_bytes).decode('ascii')
    return passphrase

# Generate a random passphrase of 32 bytes
random_passphrase = generate_random_passphrase()
print(f"Random Passphrase: {random_passphrase}")