One of the many neat things you can do in Linux is to create a "virtual disk" (which is really just a file), and you can add other files to it. We use this at work to store an xml file into a virtual disk that are xen virtual machines use when booting to configure themselves. But you could also use this as a way
to more-or-less hide files.
So first: Create the virtual disk (The exmaple creates a 10MB disk) :
`dd if=/dev/zero of=/root/name_of_virtual_disk...