Create username and password protected pages for readers

Hi,

I’d like to username and password protect some of the subpages of my site, like for readers/customers to have to sign in the see the content. I als don’t want the content on the password protected pages to be searchable with f.ex google.
How do I do that? Is there a plugin that you recommend?

I don’t want it to be only protected by a normal password protected site, but to have personal login for every reader/customer.