Re: Export locking sheet to Excel

[David Stanaway <david stanaway net>]

My issue with the style of password protection in the excel format is
that it gives a false sense of security to the user that thinks he is
protecting sensitive information.

I have had people sending me html tables in email with the background of
some sensitive columns set to black, thus appearing to black out the
sensitive data.

It would be nice to have the locked sheets implemented, but password
protected files doesn't seem very useful in any meaningful way, unless
it uses some strong encryption on the data using the passphrase as a
key. Maybe adding through goffice support for ascii armored gpg encryted
files.

On Sat, 2006-03-11 at 23:42 +0100, Klokan Petr Přidal wrote:
> Hi,
>
> I tried to wrote patch for export/import of protected 
> worksheets/workbook of Excel - attached to Bug 330129
> http://bugzilla.gnome.org/show_bug.cgi?id=330129
>
> And I discovered that protection of sheets is not implemented even in 
> native file-format .gnumeric. So I did it too, I hope it's clean 
> solution: attached to Bug 334257 
> http://bugzilla.gnome.org/show_bug.cgi?id=334257
>
> Please check that patches carefully, I'm still beginner and there could 
> be some new bugs inside.
>
> What is not implemented is storing of password. Any idea?
>
> (It's not strong security password, just for protect a bit more 
> accidental modification. Different stronger implementation should be 
> used in the future for open-only-if-you-know-password files).
>
> Excel has hash function which is described in 5.18.4 in 
> http://sc.openoffice.org/excelfileformat.pdf
>
> Klokan
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