Re: [libreoffice-users] Re: Encrypted MSO files (docx,xlsx) in Libo

Il 09/09/2011 18:27, NoOp ha scritto:
> On 09/09/2011 02:38 AM, Marcello Romani wrote:
> > Il 09/09/2011 10:28, krisb ha scritto:
> > > Hi all,
> > >
> > > This is my first message here so please be tolerant :)
> > > Maybe it is a not right place to ask, but let me start. I'm wondering if is
> > > possible to open encrypted xlsx/docx files in Libo? IMHO MSO rights and
> > > concept of protecting files exclude possibility of opening it in competitors
> > > software, since it would be a breaking of encryption algorithm and it would
> > > be against MSO rights. Am I right? The encryption methods are part which I
> > > am not well acquainted yet :)
> >
> > Let's forget for a moment MS's anti-competitor practices. Encryption
> > doesn't rely on the algorithm being secret, but on the /encryption key/
> > being secret and strong enough to be practically impossible (or
> > extremely costly) to guess with brute force.
> >
> > The fact that MS tries to keep algorithms or implementation details
> > hidden to hinder competition is a more general problem which has nothing
> > to do with encryption.
> ...
> Really? I see nothing hidden here:
>
> http://msdn.microsoft.com/en-us/library/cc313071%28v=office.12%29.aspx
> <http://download.microsoft.com/download/2/4/8/24862317-78F0-4C4B-B355-C7B2C1D997DB/%5BMS-OFFCRYPTO%5D.pdf>

Thank you for the pointer.

I was just trying to emphasize the fact that encryption algorithm 
secrecy has nothing to do with its strength, encryption-wise.
Indeed I should've written something like:
"The fact that someone *might* try to..."


--
Marcello Romani

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