HPR2791: LUKS like truecrypt

Create an empty file of a predetermined size:

$ fallocate --length 512M foo.img

Create a LUKS container on it:

$ cryptsetup --verify-passphrase luksFormat foo.img

Set it up:

$ sudo cryptsetup luksOpen foo.img foo
$ ls /dev/mapper
foo
$

Make a file system on it:

$ sudo mkfs.ext2 /dev/mapper/foo

If you don't need it for anything now, you can close it:

$ sudo cryptsetup luksClose foo
$ ls /dev/mapper
$

Mount it as a usable filesystem:

$ sudo mkdir /crypt
$ sudo mount /dev/mapper/foo /crypt

Depending on your system configuration, you may need to set up reasonable permissions:

$ sudo mkdir /crypt/mystuff
$ sudo chown klaatu:users /crypt/mystuff
$ sudo chmod 770 /crypt/mystuff
$ echo "hello world" >> /crypt/mystuff/file.txt

When you're finished using your encrypted vault, unmount and close it:

$ sudo umount /crypt
$ sudo cryptsetup luksClose foo

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