This device-mapper target allows you to create a device that
transparently encrypts the data on it. You'll need to activate
the ciphers you're going to use in the cryptoapi configuration.

Information on how to use dm-crypt can be found on

<http://www.saout.de/misc/dm-crypt/>

To compile this code as a module, choose M here: the module will
be called dm-crypt.

If unsure, say N.

source code:

drivers/md/dm-crypt.c