The machine key _is_ the hostowners password, DES encrypted with the hostowner's name, the details are in the code.
the secstore key is just that, it us useful for storing account details that the hostowner may need - for example I keep my sources account in hostowner's secstore so I can cpu -u bootes to become hostowner and then do a pull. I have to type in the hostowner's secstore key about once a year - though it is read from the nvram un onlock the hostowners secstore on every boot of my cpu/auth/file server. I use the hostowner's key once a week or so to cpu in to do a pull or if I need access to the server's /dev/kmesg or devices. -Steve
