Create a packet autenticator. All RADIUS packets contain a sixteen
        byte authenticator which is used to authenticate replies from the
        RADIUS server and in the password hiding algorithm. This function
        returns a suitable random string that can be used as an authenticator.

        :return: valid packet authenticator
        :rtype: binary string

def CreateAuthenticator():
        """Create a packet autenticator. All RADIUS packets contain a sixteen
        byte authenticator which is used to authenticate replies from the
        RADIUS server and in the password hiding algorithm. This function
        returns a suitable random string that can be used as an authenticator.

        :return: valid packet authenticator
        :rtype: binary string
        """

        data = []
        for i in range(16):
            data.append(random_generator.randrange(0, 256))
        if six.PY3:
            return bytes(data)
        else:
            return ''.join(chr(b) for b in data)