Different between Device Mapper and DM-Crypt and Cryptsetup , LUKS

saeedsssss · 09-29-2012, 04:00 AM

Hi
Device Mapper and DM-Crypt , Cryptsetup , LUKS use for encrypt disk .

what's different and relate between this four case ?

if you have picture that show place these on kernel Linux , please insert that for me .

tankyou.

nugat · 10-01-2012, 02:57 AM

Quote:

Originally Posted by saeedsssss

Hi
Device Mapper and DM-Crypt , Cryptsetup , LUKS use for encrypt disk .

what's different and relate between this four case ?

Device Mapper: A disk framework that creates virtual block device to physical block device mappings (look in /dev/mapper/ on your system)
DM-Crypt: disk encryption subsystem provided by the kernel (Linux, etc.), typically loaded as a kernel module, "dm-crypt"
Cryptsetup: a binary tool (e.g., /usr/sbin/cryptsetup) used to encrypt disks (using dm-crypt managed device-mapper mappings)
LUKS: a specification and format of on-disk encryption designed for use w/dm-crypt

so...all four are likely used if you are using cryptsetup to encrypt a drive/partition on a Linux system.