http://linuxgazette.net/114/kapil.html
You can choose any sequence of blocks on a sequence of block devices and create a new block device some of whose blocks are identified with the blocks you chose earlier.
Just think its a mapping of block device. 1-to-1, or 1-to-many, or encryption, etc...
To do transparent encryption, do following steps:
1. create key
2. create mapped block dev
3. init it, load it
$ mke2fs /dev/mapper/mydata
$ mount /dev/mapper/mydata /mnt
All the data written to /mnt will then be transparently encrypted before storing it in /dev/loop1.
4. unload it
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