Is my blog secure?

I’m using WordPress 2.03 and a web hotel with cpanel.

I want to use wordpress as a private company intranet in order to improve communications between people and departments.

I logged in to Cpanel and chose “Password protect directories” where I protected the subdomain “intranet”.
Only this subdomain points to the blog.

So whenver someone enters the URL http://intranet.site.com – they are prompted with a username and password.

My question then is: is this blog now secure?
Well, except for the chance that someone gets their hands on the username and password of course. But except for that, is it secure?

Can search engines still access the pages in the blog?
What about the RSS-feeds? Are they secure?

Security is important here so I’m very thankful for any information or help you can provide.

Thanks in advance!