We finally found that our timestamp server was not producing valid
timestamps. After correcting the server the problem is gone.

thanks


mursitorhan wrote:
> 
> Hi all,
> 
> We want to sign and add a timestamp to a PDF. We are using itext, signing
> externally (with smartcard) and adding
> time stamp as unauthenticated attribute (like ________ ). 
> 
> When we open the signed document, Adobe reader shows the
> signature(verified) but in the details, there is no timestamp
> information. 
> 
> We are hashing the result of sign operation and using it as imprint which
> is sent to timestamp server. 
> 
> From the internet, we found some example PDF's with timestamp. When we
> compare our PDF with these, 
> there is no observable differences in the PKCS7 structure. 
> 
> Is there a way to write down to PDF that PDF is timestamped? Why does the
> Adobe reader ignore timestamp? 
> What can be the problem?
> 

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