linux.com has an article on how to hide an entire file system. There are several approaches mentioned in the article, such as using the loop-AES loop back device, or using package such as FUSE or ...
How-To Geek on MSN
5 settings making your Linux PC less secure
Your Linux PC is only as secure as the settings you choose to enable (or disable).
Locking down individual files is great, but a blanket encryption will prevent anyone from getting their paws on your files.
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