Encrypting partitions using dm-crypt and the 2.6 series kernel

Tuesday, 8 June 2004, 4:16 PM EST

Back in February of this year, Andrew Morten announced that cryptoloop was being deprecated in favour of dm-crypt. Although the initial announcement caused some consternation, dm-crypt was merged into the stable tree for the 2.6.4 kernel. This article looks at how to set up an encrypted partition using dm-crypt.

dm-crypt provides a crypto layer for Device-mapper. A Device-mapper driver allows you to define new partitions or logical volumes by specifying ranges of sectors on existing block devices. The ranges of sectors to be used by these partitions is mapped to targets according to a mapping table. dm-crypt provides just such a target which can be used to transparently encrypt a block device using the new 2.6 kernel cryptoAPI.

By Mike Peters at Linux.com

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