recompile sshd with OPIE?

[Dag-Erling Smørgrav]

freebsd-security at auscert.org.au writes:
> This may sound like a really silly question, but how do I enable it? 

ChallengeResponseAuthentication Yes

(which is the default)

> There's no man[5] sshd_config entry,

Yes, there is.

> but through trial and error I
> identified an option that doesn't cause an error: SkeyAuthentication yes

Which FreeBSD version are you running?  There is no such option in any
recent OpenSSH version, and unrecognized options should cause a fatal
error.

DES
-- 
Dag-Erling Smørgrav - des at des.no