NUANCE PDF SIGNATURE VERIFICATION
Right-click the signature you wish to add LTV information to, then select Add Verification Information from the menu.Ī dialog box should appear, showing that the information has been added. Open a signed PDF in Acrobat or Acrobat Reader, then click the Signature Panel button. However, it is possible to add LTV information at a later date by following the steps below (note that your application must also be configured as shown above to enable LTV): For example, Acrobat cannot retrieve the necessary time stamp and revocation information without a network connection or if an OCSP query fails. There are several reasons why an existing signature might not be LTV enabled.
Go to top Enable LTV for an Existing Signature Signatures created with the application should now include the information necessary for long-term validation. The time stamp server you added should now have a star displayed to the left.Ĭlose the Server Settings dialog box and the application preferences. With the new time server selected, click Set Default. Select Time Stamp Servers in the left-hand menu, then click the button labeled +, with an icon of a computer.Įnter a Name and URL for a time stamp server, then click the OK button.With the Signatures preferences still open, click the More button, under Document Timestamping. Now we will configure the time stamp server. Make sure the check-box labeled Include signature’s revocation status is checked, then click the OK button to close the dialog box. LTV requires that signatures are time stamped and include all necessary revocation information. Configure Signature Preferences and Time Stamp ServerĬonfigure Signature Preferences and Time Stamp Server.
NUANCE PDF SIGNATURE HOW TO
I'm asking more on the theoretical side, although I plan to implement what I describe using iText, so any pointers on how to use it for my purpose are also welcome. My question is, if the server signs the PDFs, will it also be ensuring the continued validity of the previous signatures, even after they expire, as long as the latest signature is valid? The expiration issue arises because some of these PDFs will already have one or more digital signatures (e.g., created for legal purposes). Using SSL to serve the documents wouldn't be enough, because the files can be passed on to third parties, who don't want/need to access the server. These signatures won't be in risk of expiring, because the server can just reissue new signed PDFs when the certificate is updated. The image will be placed in the center of the page by default. In the dialog that opens, navigate to the image you want to insert and click Open. I'm thinking about doing this by digitally signing the PDFs on the server. How to add Images, Signatures, and Objects in Nuance PDF Converter Help: Images, Signatures, Objects, Imprints Adding an Image Click the Insert button in the toolbar. My overall goal is to make a set of PDFs available, in such a way that users can be assured of the provenance of the documents (i.e., they came from the origin that they are expected to come from).
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