a transparent disk encryption subsystem in the Linux kernel. It is implemented as a device mapper target and may be stacked on top of other device mapper transformations. It can thus encrypt whole disks (including removable media), partitions, software RAID volumes, logical volumes, as well as files. It appears as a block device, which can be used to back file systems, swap or as an LVM physical volume

Initialize device:

Open device:

Device will be mapped in /dev/mapper/dmname

Close device:

Show device info:

Resize device:

Define crypto targets in /etc/crypttab

After devices are unlocked they can be mounted using fstab.