最小限の権限で外部USBドライブを暗号化/復号化できますか？

使用環境ファイルシステム〜のように

   create the filesystem:

       % encfs ~/.crypt ~/crypt
       Directory "/home/me/.crypt" does not exist, create (y,n)?y
       Directory "/home/me/crypt" does not exist, create (y,n)?y
       Creating new encrypted volume.
       Please choose from one of the following options:
        enter "x" for expert configuration mode,
        enter "p" for pre-configured paranoia mode,
        anything else, or an empty line will select standard mode.
       ?>

       Standard configuration selected.
       Using cipher Blowfish, key size 160, block size 512
       New Password: <password entered here>
       Verify: <password entered here>

   The filesystem is now mounted and visible in ~/crypt.  If files are
   created there, they can be seen in encrypted form in ~/.crypt.  To
   unmount the filesystem, use fusermount with the -u (unmount) option:

       % fusermount -u ~/crypt

--マニュアルから抜粋しました。

ヒューズ必要です。