shutting down dictionary attacks

I run OpenBSD 3.7  with OpenSSH 4.1, and found that even with:
 
        PermitRootLogin no
        PasswordAuthentication no
        Protocol 2
        ChallengeResponseAuthentication no

Using OpenSSH or Putty from test PCs, I couldn't supply a password, but the
script kiddies were still finding a way to make password attacks.  Obviously,
their skills are certainly better than mine. 

Searching The Fine Archive, I found 
http://marc.theaimsgroup.com/?l=secure-shell&m=109755336414758&w=2

which suggests

        PAMAuthenticationViaKbdInt no

as an additional config setting.  It's not applicable to OpenSSH 4.1
on OpenBSD. But, poking through sshd(8) I found:

        KerberosOrLocalPasswd no

After adding that to my config, it *seems* like my attacks may have 
been stopped.  At least, they're no longer being logged.

Any thoughts on whether this change will be effective, or if this was just
serendipitous?

   -Josh Grosse-