veracrypt

Free and open source disk encryption software. More information: https://www.veracrypt.fr/code/VeraCrypt/plain/doc/html/Documentation.html.

Create a new volume through a text user interface and use /dev/urandom as a source of random data:

veracrypt --text --create --random-source={{/dev/urandom}}

Decrypt a volume interactively through a text user interface and mount it to a directory:

veracrypt --text {{path/to/volume}} {{path/to/mount_point}}

Decrypt a partition using a keyfile and mount it to a directory:

veracrypt --keyfiles={{path/to/keyfile}} {{/dev/sdXN}} {{path/to/mount_point}}

Dismount a volume on the directory it is mounted to:

veracrypt --dismount {{path/to/mounted_point}}