from: https://lists.debian.org/debian-user/2014/02/msg00275.html
On 02/05/2014 01:23 PM, Tino Sino wrote:
Can I invoke the CLI disk partitioning/encryption wizard I used to install the OS to configure a new external USB drive? How?
I use the cryptsetup(8) program from the command line. Here's a HOWTO: http://www.cyberciti.biz/hardware/howto-linux-hard-disk-encryption-with-luks-cryptsetup-command/ For a large data drive, I typically skip the "dd if=/dev/zero of=..." step.