CentOS 5.3: Creating Encrypted Block Devices

[ Thanks to Mike Weber for this link. ]

"The encryption is done using dm-crypt/LUKS. LUKS or Linux Unified Key Setup, provides the disk format for the data as well as it provides the passphrase/key management policy. LUKS uses the dm-crypt module which is a kernel mapper subsystem and manages the encryption and decryption for the block device. This is the same subsystem that is used by LVM so that it has proven itself to be stable. One of the advantages of LUKS is that the underlying contents of the block device are arbitrary so that you can encrypt your SWAP space. You can encrypt ext3, LVM physical volumes, and RAID arrays with LUKS. A disadvantage of LUKS is that it is not a good choice for file level encryption."

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