Sometimes it’s best that the very presence of a filesystem is hidden…
Simple file encryption is useful, but sometimes it’s more useful to encrypt a complete filesystem or disk, such as when you need to protect a large set of files. Or you may need not only to protect, but to completely hide the presence of sensitive data from prying eyes. For these cases, here are several options for securing your systems.
Moved: http://linuxpoison.blogspot.com/ 
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