add_action('admin_notices', 'admin_notice_check_authentication_keys_and_salts');

function admin_notice_check_authentication_keys_and_salts() {
	if (AUTH_KEY == 'put your unique phrase here') {
		echo ' <div class= "error" ><p>Your Authentication Unique keys and salts are still set to their default values in wp-config.php.</p></div>';
	}
}