Magikfs
From Just Solve the File Format Problem
Magikfs - The Steganographic Filesystem On Linux by Anoop.S., Shibin.K., Varun Suresh and Vivek.K.P is a highly secure steganographic filesystem with the plausible deniability feature that works on an existing ext2/ext3 partition without any structural modifications.
It's better than encrypted filesystems due to the fact that files remain hidden in Magikfs unlike in encrypted filesystems.
It requires both the filename and the password to show the hidden file.
