keyboard-interactive only authentication

how can i configure my openssh to accept only
keyboard-interactive logins?
if i specify PasswordAuthentication no then my ssh
client says No supported authentication methods left
to try!

i want this especially because i see alot of password
brute force attacks on my server. i`ve studied the
script kiddies tools and the most widely used use only
the password authentication schema so this will be a
quick workaround.

if you know a better solution for these attacks please
let me know.

PS i`m using openssh-4.3p2

Regards,
Geo

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