I've got my own webspace and I'd like to set up a private invite only forum, I've had one previously on my webspace but I rarely used it and came back a year later to look and it was covered in porn spam. I don't want anything to fancy, there'll only be 10 or less members but I'd just like something easy to set up and private and secure. The old one I was using was phpBB.

http://www.simplemachines.org/

phpbb is the generic choice these days, just keep it up to date

its attacked regularly because its so common, because its so good