SHA-1 in shadow file

[m.roth at 5-cent.us]

> Is it possible to convert the hashing in the /etc/shadow file on an
> existing RH server (RHEL 4 or 5) from MD5 to something like  SHA-1,
> without major disruptions of operations?
>
> If so, how would one go about doing it?

I'd think about SHA-3, at least, though was it 3 that was recently
cracked, and they're suggesting something higher?

      mark