Name

       pmt-ehd - create an encrypted disk image

Syntax

       pmt-ehd [-DFx] [-c fscipher] [-h hash] [-k fscipher_keybits] [-t fstype] -f container_path -s size_in_mb

Options

       Mandatory  options  that  are  absent are inquired interactively, and pmt-ehd will exit if stdin is not a
       terminal.

       -D     Turn on debugging strings.

       -F     Force operation that would  otherwise  ask  for  interactive  confirmation.  Multiple  -F  can  be
              specified to apply more force.

       -c cipher
              The  cipher  to be used for the filesystem. This can take any value that cryptsetup(8) recognizes,
              usually in the form of "cipher-mode[-extras]".  Recommended are aes-cbc-essiv:sha256 (this is  the
              default) or aes-xts-essiv:sha256.

       -f path
              Store  the  new  disk  image  at  path.  If  the  file  already exists, pmt-ehd will prompt before
              overwriting unless -F is given. If path refers to a symlink, pmt-ehd will act even more cautious.

       -h hash
              Message digest/hash used for key derivation in the PBKDF2 stage. The default is sha512.

       -i cipher
              (This option had been removed in pam_mount/pmt_ehd 2.11.)

       -k keybits
              The keysize for the cipher specified with -c. Some ciphers  support  multiple  keysizes,  AES  for
              example  is  available with at least the keysizes 192 and 256.  Defaults to 256 (to match aes-cbc-
              essiv). Note that XTS uses two keys, but drawn from the  same  key  material,  so  aes-cbc-256  is
              equivalent to aes-xts-512, and aes-cbc-128 is to aes-xts-256.

       -p path
              (This option had been removed in pam_mount/pmt_ehd 2.11.)

       -s size
              The  initial  size  of  the  encrypted  filesystem,  in megabytes. This option is ignored when the
              filesystem is created on a block device.

       -t fstype
              Filesystem to use for the encrypted filesystem. Defaults to xfs.

       -u user
              Give the container and fskey files to user (because the program is usually runs as root,  and  the
              files would otherwise retain root ownership).

       -x     Do not initialize the container with random bytes. This may impact secrecy.

   Description
       pmt-ehd  can  be used to create a new encrypted container, and replaces the previous mkehd script as well
       as any HOWTOs that explain how to do it manually.  Without any arguments, pmt-ehd will interactively  ask
       for all missing parameters. To create a container with a size of 256 MB, use:

       pmt-ehd -f /home/user.cont -s 256