Yes, please send example documents. I think I know what you are seeing but I
REALLY need to see some PDFs to verify.
Thanks,
Leonard
On 2/5/09 4:46 PM, "Alexis Pigeon" <[email protected]> wrote:
First a reply in english, spanish is following.
Primero en inglés, y en castellano más abajo.
On 05/02/2009, Alexis Pigeon <[email protected]> wrote:
And here is the translation... Please remember that I'm no specialist in
digital signatures, so I might misunderstand some concepts here, thus some
possible glitches in the translation... I'll but any comment of mine between
squared brackets.
On 05/02/2009, Juan Francisco Martínez Chinchilla <[email protected]> wrote:
Muchas gracias, mi ingles es demasiado malo.
Mi problema es el siguiente:
Uso la ultima version de itextsharp para firma digitalmente la documentacion
hasta aqui es correcto todo el proceso, el problema viene cuando añadimos una
firma con nivel de certificacion, sino añadimos unos sellos (imagenes de
VISADO) con la ultima firma, las demas firmas en adobe 9.0 aparecen como NO
VALIDAS mientras que con sus versiones anteriores (adobe 8.0 o inferior)
aparecen correctamente. Sin embargo sino añadimos los sellos todas las firmas
aparecen correctamente en adobe 9.0.
We (referring to the OP) use the latest version of iTextSharp in order to sign
documents.
The problem is that when we add a signature with some level of certification
[translator : not sure about that one]. If we don't add images [translator :
from the context, I guess the OP means "If we DO add images"] with the last
signature, the other signatures appear as NOT VALID in adobe 9.0 while
appearing correctly in previous versions (adobe 8.0 and lower). However, if we
don't add images [translator : in that case, I guess the OP really meant so]
all signatures appear correctly in adobe 9.0
[ENGLISH]
I'll just repeat myself here. I'm no digital signature specialist, but I
understand that a signature shouldn't be valid over a document that's been
modified by adding an image *after* the signature was added, but that adding a
signature isn't considered as a modification, thus keeping the validity of the
previous signature(s).
For further inspection, it would be quite practical if you could send :
- the original signed document
- the modified document (signature only)
- the modified document (signature + image)
- a short standalone piece of code that helps us produce the 2 modified
documents.
HTH,
alexis
[SPANISH]
Voy a repetir lo que te comente. No soy ningun experto en firmas digitales,
pero entiendo que una firma tiene que ser invalida si el documento ha sido
modificado añadiendole una imagen *despues* de haber fimado el documento, pero
que solo añadir una firma no se considera como una modificacion, por lo cual
las firmas anteriores no aparecen invalidas.
Para que podamos ayudarte, nos vendría muy práctico que envies a esta lista:
- el documento original
- el documento modificado (firma solo)
- el documento modificado (firma + imagen)
- un pequeño trozo de código que nos permita producir estos 2 documentos
modificados.
Saludos,
alexis
--
Leonard Rosenthol
PDF Standards Architect
Adobe Systems Incorporated
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