Re: Export locking sheet to Excel



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
_______________________________________________
gnumeric-list mailing list
gnumeric-list gnome org
http://mail.gnome.org/mailman/listinfo/gnumeric-list





[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]