Another Nexon Mistake

'Security through obscurity' is not security at all. There's a reason the term is a pejorative.

http://en.wikipedia.org/wiki/Security_through_obscurity
http://slashdot.org/features/980720/0819202.shtml
http://stackoverflow.com/questions/53396...a-bad-idea

And on and on and on.
If you've been counting on no one knowing you who are as your first line of defense, welcome to reality - Anonymity is neither protection nor realistic.

That's all very well when you're designing a security system, but for the end user, obscurity is the only security you get - if someone finds out your login information, they can perfectly imitate you, whatever form that information takes. So ideally you want to keep as much of it secret as possible, frequently change whatever possible (so it's harder for someone to collect the full set at one time), etc.