WIKI Pro - Can you add a generic password protection to the entire wiki

I am keen to know if you can set a generic password to limit access to users whom don't and won't have a WordPress account, but can gain access to the wiki content if provided a generic password? i.e. "bobswiki"

I assume with the visibility option (if still available) you can password protect individual wiki post/pages as per the standard WP functionality, but i am keen to know about the protecting the entire wiki.

Thanks for your insight!