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Old 10-01-2006, 02:59 AM   #1
Zmyrgel
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Loop-AES questions


Hi,

I was thinking on making a distro hop again, this time to Arch. I have used Arch once before but that didn't impress me as I din't even get my nVidia drivers installed

Im currently running Debian Sid with encrypted LVM partitions using the dm-crypt.
After browsing net a bit and making myself more familiar to encryption options I though to try the loop-AES as it seems to be more secure and faster option than the dm-crypt.

Does loop-AES work with LVM or how?

Correct me if I'm wrong, you can install a Arch and then encrypt the existing installation without erasing the data on partition with loop-aes?

I'm planning on using the Suspend2 also with the loop-aes. I'll follow this http://wiki.suspend2.net/EncryptedSwapAndRoot.

After I have sufficient info I think I try to install it on my laptop.
 
Old 10-02-2006, 05:05 PM   #2
stress_junkie
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I thought I knew the answer to your questions but I decided to verify what I thought I knew. It turns out that there is so much to know about this subject that I would like to just refer you to the sources that I found.

I have this file on my system partition.
/usr/share/doc/packages/util-linux/README.loop-AES-v2.2d

Also you can look for the web page here.
http://loop-aes.sourceforge.net/

I wish that I could have summarized it in a couple of sentences but I think that you really need to read the full story.
 
Old 10-03-2006, 08:50 AM   #3
Zmyrgel
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I've read that readme and it would seem that system installed and then encrypted doesn't get wiped, is this correct?

What about LVM? Can I use LVM partition and encrypt that with loop-aes?
 
Old 10-03-2006, 09:12 AM   #4
stress_junkie
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The essential model is like this. You have a physical device. You associate an encryption module with a loop device and then create a link from this encrypted loop device to the real device. Then you communicate with the loop device. The real device can be a file, a disk, or a virtual device like a RAID set.

I wrote up the details for using a file as an encrypted file system. The principles remain the same. Check out this post of mine.

http://www.linuxquestions.org/questi...33#post2416433

I seem to recall something about encrypting a file system that already has data on it and keeping the data. I don't recall how that is done or what tool to use.

Last edited by stress_junkie; 10-03-2006 at 09:15 AM.
 
Old 10-03-2006, 09:36 AM   #5
Zmyrgel
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Quote:
Originally Posted by stress_junkie
I seem to recall something about encrypting a file system that already has data on it and keeping the data. I don't recall how that is done or what tool to use.
I read the loop-aes readme and nothing in the root partition encryption seems to wipe the data from the partition AFAIK. Would be nice to know before I start to mess around with this

LVM issue isn't that important currently as I have only the root partition besides boot and swap.
 
Old 10-04-2006, 03:14 AM   #6
Zmyrgel
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I think that I just try to install this and after this fails I'll go back to wiping my partition and do a fresh install with dm-crypt and luks.
 
Old 10-04-2006, 05:39 AM   #7
stress_junkie
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That is often the best approach. Make a backup. Try something. If it works then that's good. If it doesn't work then you still have your backup. Either way you learn something.
 
Old 10-04-2006, 06:05 AM   #8
fotoguy
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I'm just starting to mess around with AES-loop encryption with a distro im making from slackware, so this thread myight be worth keeping an eye on
 
Old 10-04-2006, 12:44 PM   #9
Lotharster
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If you want to encrypt an xeisting partition, you can use aespipe and dd:

Code:
 dd if=/dev/hda1|aespipe (...)|dd of=/dev/hda1
This encrypts your first hard disk partition with loop-aes. You can also insert a lvm device instead of hda1. Of course, you should not do that with a partition that is currently mounted, and if something goes wrong during encryption (which will take some time depending on the disk size), e.g. a power failure, you will have a disk which is partly encrypted. So do a backup before you encrypt partitions with important stuff on them.

Btw, you can also use aespipe to encrypt iso files. That way, you can encrypt cdroms.

Regards,

Lotharster
 
  


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