Text only viewable by logged in users

[shiznatix]

I have a forum post that I would like to make for a tournament but in this post I have to give out a password. Now I don't want just anybody browsing the forums to see the password, I want it to be only visible if you are logged into the forums. So if I was NOT logged in and went to this thread it would look something like this:

Blah blah blah blah blah blah
password: *you must be logged in*
Blah blah blah blah blah blah

but if I WAS logged in, it would look like this:

Blah blah blah blah blah blah
password: super_awesome_password
Blah blah blah blah blah blah

Is there a mod or something that can give me this or should I start diving into the class_bbcode.php and hope for the best? I have tried making a custom bbcode tag but it won't parse PHP