3 Replies Latest reply on May 14, 2013 3:42 PM by IsakTen

    Can the life of a digital signature be extended?

    Johnny Steele

      I have some users that want to know if the life span of a digital signature can be extended?  Currently, the signatures expire after 5 years.  We use Acrobat 8 Standard and newer versions of Reader.

       

      Thanks,

       

      John

        • 1. Re: Can the life of a digital signature be extended?
          Mauro Giovetti

          Per abilitare la convalida a lungo termine, occorre:

          dopo aver firmato il PDF, salvarlo con il comando "Salva come altro..." / "PDF con funzionalità avanzate di Adobe Reader" / "Abilita creazione commenti e misurazione..."

          • 2. Re: Can the life of a digital signature be extended?
            IsakTen Level 4

            No, this does not enable long-term validation.

            • 3. Re: Can the life of a digital signature be extended?
              IsakTen Level 4

              If you already have a signed PDF you need Acrobat 9.1 or later to do that. Right-click on a signature and select "Add Verification Information". Save PDF. The long-term validation will be honored in Acrobat/Reader 9.1 and later. The signature must be Valid in order for the  "Add Verification Information" command to work.

              If you are just signing a PDF do the following before the signing: Go to Edit->Preferences->Security->Advanced and select "Creation" tab. Check "Include signature's revocation status when signing" check box. This works in Acrobat 8 and earlier versions. In Acrobat 9 and later this is the default. In versions earlier than 9 the default was that this check box was unchecked. In Acrobat XI the location of this dialog has moved. It is now in Edit->Preferences->Signatures->Creation&Appearances->More...

              If you have PDFs that have many signatures it is better to uncheck this check box and to use  "Add Verification Information" command, provided that the recipients of these PDFs have newer Reader/Acrobat versions. This makes PDFs with multiple signatures smaller.