import secrets

def generate_key(length: int = 64) -> str:
    """Generate a strong random key for internal use."""
    return secrets.token_hex(length)

def apply_key(data: str, key: str) -> str:
    """Internal key application: simple example scramble (for demo)."""
    # In practice, replace with your ultra-secure algorithm
    scrambled = "".join(chr((ord(c) + ord(key[i % len(key)])) % 256) for i, c in enumerate(data))
    return scrambled
