ssh fingerprints for bastion hosts

Those of you who use our bastion host (citadel.ch.cam.ac.uk) may know something about ssh fingerprints: these are identifiers used by ssh servers which allow you to check that you really are connecting to the right server, and allow you to verify that your network traffic hasn’t been intercepted by a malicious third party.
We’ve updated http://www.ch.cam.ac.uk/computing/network-bastion-host to include the fingerprints of citadel (along with their Randomart ASCII representations, which lets you see at a glance whether or not the fingerprint is correct or not)