[Haifux] Nested disk encryption

[Eli Billauer]

Hi and thanks to those who answered.

Since nobody stood forward and told me I'm going to do something stupid, 
I took some courage, and pulled my little stunt. As one could expect, it 
worked like a clockwork. I never did an exhaustive test, but settled for 
what I really needed to do, which was storing around 20 GB of data in 
files of different sizes and shapes, in the secured image. Which is not 
a negligible operation.

I kept a look on /var/log/messages and nothing special appeared there. 
The only annoyment was that the computer becomes extremely sluggish 
during a heavy copy operation (despite ionice), but that is also true 
when going directly on the single-encrypted LVMed RAID disk (or maybe 
this is true on whatever disk?).

I wrote a small script which turns a plain file into an encrypted ext4 
image. I prefer having a script wipe out my disk because I got the bash 
programming wrong over having the same effect because of not being 
concentrated for a split second.

You can have a look, even try it out and then NOT blame me:
http://billauer.co.il/blog/2010/09/encrypted-disk-image-dm_crypt-luks/

Gmar Hatima Tova,
    Eli

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Web: http://www.billauer.co.il