veracrypt
Free and open source disk encryption software. tldr-pages
On Linux
Linux
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/urandomIdentifyDecrypt a volume interactively through a text user interface and mount it to a directory
veracrypt --text path/to/volume path/to/mount_pointIdentifyDecrypt a partition using a keyfile and mount it to a directory
veracrypt --keyfiles path/to/keyfile /dev/sdXN path/to/mount_pointIdentifyDismount a volume on the directory it is mounted to
veracrypt --dismount path/to/mounted_pointIdentify