Re: [libreoffice-users] Encrypted Calc file got corrupted

Cley, thanks a lot, that indeed sounds like a good suggestion as these
corruptions do happen every once in a while.

Is there perhaps any other way to repair/analyse the file?

Many thanks again to everyone.

Best,
Adam

On Mon, Feb 29, 2016 at 11:49 AM, Cley Faye <cleyfaye@gmail.com> wrote:

> 2016-02-29 12:20 GMT+01:00 Adam Bujdoso <adam.bujdoso@gmail.com>:
>
> > Does anyone have an idea how the file could be repaired? I am happy to
> > forward the file if someone has a tool to examine it, or perhaps to
> recover
> > it.
>
> ​Unfortunately, I can't do it myself because I lack the time to do so, but
> if someone's up to the task, it could be interesting to have an "extractor"
> for secured files.
>
> From my understanding of the specification, password-protected files are
> "just" like regular files, meaning that they still are ZIP containing
> multiple files. The password-protection is not at the ZIP level, but
> instead relevant files are encrypted before they are stored in the ZIP
> file.​ To remain efficient, these files are compressed using deflate (the
> same algorithm used in zip files) *before* encryption, and then simply
> stored in the ZIP file.
>
> An extracting tool could extract the content of the ODT/ZIP file, and using
> the password decrypt the relevant files. This would make the file
> "components" available for further examination. Since sometimes file
> corruption can merely mean a malformed closing tag in the XML that makes up
> the core of a document, it could be helpful.
>
> This could also make for a useful side-tool for LibreOffice, since these
> corruptions, as rare as they are, still happens sometimes even on
> unencrypted files.
>
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