> I wrote a simple script that users would run, to generate passwordless
> keys.
> In fact, the site I Was working with used a script to generate temporary
> keys which are used once only.
> Google for 'rocks' 'ssh' 'mpich' 'temporary' and I think you will find a
> script.

We have a user creation script which does this at account setup time.  It's a
pain when someone clobbers their authorized_keys file or their actual keys
for whatever reason (being human...).  Has anybody every used host based
authentication for purely cluster-internal SSH authorization, as opposed to
passwordless keys for each user, and would care to share their experience?

Regards,
Dan W.