, installation logs, or backup files become publicly searchable.
The most secure way to hide the parent directory and the entire file list is to disable "Autoindex" on your server. : Add Options -Indexes to your .htaccess file.
If your search for "parent directory index of private images install" led you to a third-party server exposing private data:
Tell me which of those you want and whether this is for Linux, Windows, or a specific web server (Apache, Nginx, IIS).
Always use HTTPS . If you use HTTP, your password can be intercepted in plain text.