RE: [libreoffice-users] password problem

Bob,

No worries about running the test.  It looks like the file extracted without any problem.  Most Zip 
utilities have an option to test a package rather than extract it.  The test report would indicate 
whether or not one of the files had some sort of discrepancy.  You can try it, but it looks like it 
should pass. 

The difficulty for you is that all of those files are still encrypted.

It appears that it is not the Zip that is corrupted, so you have to consider that there was an 
encryption failure.  

Now we need someone who can use the manifest.xml and those individual files and see which ones can 
be decrypted with the known password.

Depending on which file is damaged, you might be able to try operating without it.

I don't have any tools that will do this, although there are some ways we might be able to 
manipulate the manifest to trick LibreOffice into doing it for us.  

I don't know how to talk you through this.  So it depends on having the document to manipulate and 
either knowing the password or sending modifications back to you to see if you can get one of the 
modifications to open far enough to be useful.

So I suppose it comes down to how willing you are to let the document out of your hands, even in 
its encrypted form.

 - Dennis



-----Original Message-----
From: Bob Stia [mailto:rnr@pasco.org] 
Sent: Saturday, August 06, 2011 14:40
To: users@global.libreoffice.org
Subject: Re: [libreoffice-users] password problem

On Friday 05 August 2011 00:37:47 Dennis E. Hamilton wrote:

......<lots of snipping so we can focus>..........

Dennis. sooooo, following your advice:

> One thing you can do with the file that fails is try to open it with a Zip
> utility and run a test on it.  If the Zip tests all right, it means the
> corruption occurred during encryption, not later, during writing.  If the
> Zip indicates any part of the document is corrupted, you might see if a Zip
> repair utility can help.
OK, I opened the file as a zip. Here is what I got:

Archive:  Experience.zip
 extracting: mimetype
 extracting: content.xml
 extracting: layout-cache
 extracting: manifest.rdf
 extracting: styles.xml
 extracting: meta.xml
 extracting: Configurations2/accelerator/current.xml
   creating: Configurations2/progressbar/
   creating: Configurations2/floater/
   creating: Configurations2/popupmenu/
   creating: Configurations2/toolpanel/
   creating: Configurations2/menubar/
   creating: Configurations2/toolbar/
   creating: Configurations2/images/Bitmaps/
   creating: Configurations2/statusbar/
 extracting: settings.xml
  inflating: META-INF/manifest.xml

I don't quite understand what you mean by running a test on it. All, or most 
of those files have now appeared in the directory where I unzipped the file.
Are they useful for any recovery?

We hsave determined....what ??

> The corruption could be in the key information rather than in the file
> (which would be very bad, since there is almost no way to recover if that
> is the case).  If the corruption is in the file, the form of encryption
> used tends to limit mistakes (that is, things tend to go right again after
> a while).  Because the decrypted file is a compressed stream inside of a
> Zip, decompression can also go off the rails.  But it may be possible to
> recover whatever there is.

Do you think this is what happened to me?

> But at this point, password recovery won't help 
> because your password is not the problem.  It takes some serious forensic
> tools to now attempt a recovery, and I don't know who might have those that
> work with the encryptions that are used for ODF documents.
You're saying this is NOT my problem since I was able to unzip it?

> You may also be able to find a backup of the unencrypted file on your
> system.  You should look for that.  Also, if you can reconstruct from an
> earlier version of the file, that would be good. JeepNut was able to find a
> backup to recover a seriously-corrupted file (crash during save) in a post
> last Friday.  Look in Tools | Options | LibreOffice | Paths and see where
> the Backups are in the list of Paths used by LibreOffice.  You might also
> be able to find something in Temporary files (that's a stretch).
Nope, I checked that out and there was nothing. I also did a lot of googling 
and followed some URLs suggested on this thread. Saw something about using a 
hex-editor but didn't understand it, and it didn't seem as though the 
circumstances were the same.

Hope you or someone else can guide me a little further along this path.

Bob S
>

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