I finished making a new frontend for cryptsetup - crypttoolbox.
crypttoolbox is written with gtkDialog like SliTaz tools. And you can do all operations with it - run all kind of cryptsetup action, make file system, wipe out a device with random data.
dm-crypt is suitable for protecting data on removable media.
Official SliTaz may not run all commands of cryptbox . I recommend that crypto kernel modules are recompiled and cryptsetup(>=1.1.0-rc1) is upgraded.