Re: [opendocument-users] how to define fields of odt, which would not be affected by digi-signature?

["Jurgis Pralgauskis" <jurgis.pralgauskis@gmail.com>]

> I'm not sure I understand your use case.  If the photo or signature of the
> signer is not itself included in the hash, then what prevents someone from
> replacing the photo or signature without breaking the digital signature?  Is
> that what you really want to allow?

the photo would be signed independantly only by it's signee

so that if the document is to be signed by several persons
they sign only the content but not each others signatures

ps.: but the ability to define the hierarchy of signing would also be
of interest, though still there seems to be no software who handles
this.
For now MSO works the way, that everyone signs independently (with
optional graphics). OOo independantly (without graphics).
Colleague mentioned, that , for example, Adobe Reader (or writer)
signes the whole document including the previous signatures (no
graphical representation), and only the last signature is supposed to
be valid, and if you  want to validate other signatures, you have to
recursively detach the signatures.

again thanks in advance
-- 
Jurgis Pralgauskis
jabber: jurgis@akl.lt; skype: dz0rdzas;
Don't worry, be happy and make things better ;)