Re: [office] RE: Part 3 CD01 7.2.1 PD1.4 Forbids encryption of signatures

[robert_weir@us.ibm.com]

"Andreas J. Guelzow" <andreas.guelzow@concordia.ab.ca> wrote on 04/30/2010 
12:53:47 PM:

> 
> Re: [office] RE: Part 3 CD01 7.2.1 PD1.4 Forbids encryption of 
signatures
> 
> On Fri, 2010-04-30 at 10:34 -0600, robert_weir@us.ibm.com wrote:
> > It is just defining 
> > the behavior for the real-world complexity that already exists.  You 
can 
> > receive an encrypted documented and then want to sign it. 
> 
> Why would you want to sign an encrypted document? 
> 
> Andreas


It depends on the context.  In some cases signing indicates authorship.  I 
sign what I wrote.  In other cases signing denotes approval.  I reviewed 
the document and I sign it to indicate that I approve it.  Whether or not 
it is also encrypted is an orthogonal question.  Certainly I wouldn't want 
to sign something I cannot also decrypt.  But I might want to sign 
something that only a small number of people can read, like a private 
contract.

-Rob