Tamas,
Tamas wrote: > > I have 3 different certificate, AC, BC, CC and 3 xml document AX, BX, CX. > > version 1: I would like to create an empty pdf doc with AX as document > attachment, then sign it with with AC. > version 2: In the next step Id like to add BX as document attachmet and > sing it with BX as visible signature. > version 3: In the final step Id like to add CX as document attachment and > sign it with CX as visible signature. > > Id like if the CC signature of the result_version_3_pdf would be valid. > From the result_version_3_pdf Id like to retrieve the version 1 pdf with > valid AC signature. > From the result_version_3_pdf Id like to retrieve the version 2 pdf with > valid BC signature. > Which tool is to be used to test validity? If you use iText, there should be no problem. If you are using Adobe software, I'm not that sure about the validity state shown during each and every phase or sub-phase of your workflow. The overall signature validity state may not always be ok. You can, on the other hand, inspect the individual signature validity states, and there should be no problem with them. You might have a small misconception, though, as for version two and three you say you add a document attachment and sign IT. Actually you don't merely sign the new attachment, you sign the whole PDF file including all formerly added attachments. Tamas wrote: > > (With the result pdf Id like to make sure that the AX is added by the > owner of AC, the BX is added by the owner of BC and the CX is added by the > owner of CC.) > By checking the signatures and comparing the attachments of the signed revisions you can do that. You should be aware, though, that it does not suffice to check whether between version n-1 to n the nth attachment has been added; you also have to check whether any former attachments have been replaced (i.e. the old attachment has been removed from the attachment list while an additional new attachment has been added). Otherwise the final document might be misleading in spite of all signatures individually being valid. Regards, Michael. -- View this message in context: http://old.nabble.com/Append-existing-signed-PDF-with-content-in-such-way-signature-stays-valid.-%28generation-next%29-tp26132337p26160095.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/
