Tomb is a free and easy to operate desktop application for fairly strong encryption of personal files. A tomb is like a locked folder that can be transported and hidden in filesystems; its keys are password protected and can be kept separate, for instance keeping the tomb file in your computer's harddisk and the key file on a USB stick.

Tomb relies on dm-crypt (and cryptsetup) as an encryption backend using the aes-xts-plain64 cypher.