dm-crypt

dm-crypt is a transparent disk encryption subsystem in the Linux 2.6 kernel that provides a generic way to create virtual layers of block devices that can do different things on top of real block devices like striping, concatenation, mirroring, snapshotting, and more.
 dm-crypt
Price
Free to download
Size
-
License
GNU GPL v2
DeveloperChristophe Saout
Website
www.saout.de
System Requirements
Kernel 2.6 and later
Support Sites:Mailing List, dmc-crypt and LUKS
Selected Reviews:
Linux.com
Features include:

• Support advanced modes of operation, such as XTS, LRW and ESSIV (see disk encryption theory), in order to avoid watermarking attacks
• Encrypt whole disks (including removable media), partitions, software RAID volumes, logical volumes, as well as files
• Provides transparent encryption of block devices using the new Linux 2.6 cryptoapi
• Offers similar functionality to cryptoloop but with clear code and a more flexible configuration
• Highly flexible
• Can be used for encrypting any disk-backed file systems supported by the operating system, as well as swap space
• Encrypt RAID volumes and LVM physical volumes
• Configured to provide pre-boot authentication through an initrd

download: http://www.saout.de/misc/dm-crypt/

(Source:linuxlinks.com)