Re: [dm-crypt] reinstallation

[RaMaier@gmx.de]

Sorry for the unclear statements.
Here are the answers:
I did not repeat the steps.
/dev/sda2 holds the encrypted data.

Here my description what has happened. Hopefully it becomes clearer now.
 
What I wrote were the initial steps I perforemed when I first set up the partition (/dev/sda2).
Again I did not repeat them now.
After my old PC had died I installed the RAID controller in a new PC and installed Debian. (/dev/hda) cryptsetup is now already included. (Thanks for the hint Arno)
Since it's a hardware controller the files on the not encrypted partition (/dev/sda1) were immediately available.
Now I am looking for the steps I have to perform to access the data in the encrypted partition (/dev/sda2) again, without destroying them.

When I now enter
cryptsetup luksOpen /dev/sda2 tresor
I get 
Command failed: No steup backend available

Best regards
Rainer


-------- Original-Nachricht --------
> Datum: Wed, 12 Aug 2009 01:06:31 +0300
> Von: Moji <lordmoji@gmail.com>
> An: dm-crypt@saout.de
> Betreff: Re: [dm-crypt] reinstallation

> I do not entirely understand your question, so I apologize if my answer
> is not what you are looking for.
> 
> If you repeated those steps then any information on /dev/sda2 will be
> lost forever.
> 
> "luksFormat" writes the luks header information, that includes the key
> that decrypts the rest of the partition(device). If there is an old key
> it will write over it making any old data on that luks partition
> effectively unrecoverable.
> 
> "luksOpen" uses your supplied key to decrypt the device key stored in
> the header information and then maps it to /dev/mapper/.
> 
> If I understand your original post, the "/dev/sda2" is currently
> unencrypted data? If that is the case then you MUST copy that data over
> to another device while you set up then encrypted partition, then
> transfer it back, as the steps you listed will erase your old partition.
> 
> -MJ
> 
> RaMaier@gmx.de wrote:
> > Hi Hannes,
> > in the documents I keep. I found that I had encrypted /dev/sda2. The
> procedure I recorded was:
> > umount /dev/sda2
> > cryptsetup luksFormat /dev/sda2
> > cryptsetup luksOpen /dev/sda2 tresor
> > mkfs.ext3 /dev/mapper/tresor
> > mount /dev/mapper/tresor /tresor
> > 
> > What will happen if I repeat the steps ?
> > Should I just leave the mkfs.ext3 out ?
> > Would I be able to access my old data again ?
> > What does lufsFormat really do ? Format the partition ?
> > As I staded the data is pretty valuable to me.
> > 
> > thanks for your help.
> > Best regards
> > Rainer
> > 
> > 
> > -------- Original-Nachricht --------
> >> Datum: Tue, 11 Aug 2009 16:01:56 +0200
> >> Von: Hannes Erven <h.e@gmx.at>
> >> An: Rainer Maier <RaMaier@gmx.de>
> >> CC: dm-crypt@saout.de
> >> Betreff: Re: [dm-crypt] reinstallation
> > 
> >> Hi Rainer,
> >>
> >>
> >>> How can I reinstall LUKS on my new Debian (Lenny)?
> >> I guess the debian (and thus cryptsetup) installations on your old
> >> machine weren't that up to date, right?
> >>
> >> With the new debian lenny, you don't need to install anything: LUKS is
> >> already included in the default cryptsetup package you should already
> >> have installed (http://packages.debian.org/lenny/cryptsetup ).
> >>
> >>> >From http://code.google.com/p/cryptsetup/:
> >> "The former version of cryptsetup only had low-level operations for
> >> dm-crypt ready, and around version cryptsetup-luks 1.0.5 was renamed to
> >> be the official version of cryptsetup. "
> >>
> >> You still might have to change your old scripts, if you have some, to
> >> just call cryptsetup instead of cryptsetup-luks .
> >>
> >>
> >> HTH, best regards
> >>
> >> 	-hannes
> >>
> >>
> >>
> >> _______________________________________________
> >> dm-crypt mailing list
> >> dm-crypt@saout.de
> >> http://www.saout.de/mailman/listinfo/dm-crypt
> > 
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