5 Replies Latest reply on Oct 9, 2017 10:11 AM by margueritek

    The document has two digital signatures, why see only one

    zhangl15965901 Level 1

      The document has two digital signatures, and why use Adobe Reader to see only one digital signature and one signature picture.Second signatures cannot be recognized!

        • 1. Re: The document has two digital signatures, why see only one
          zhangl15965901 Level 1

          Thank you, everyone, just the message hasn't been edited and sent out, sorry

          • 2. Re: The document has two digital signatures, why see only one
            zhangl15965901 Level 1

            The document has two digital signatures, and why use Adobe Reader to see only one digital signature and one signature picture.Second signatures cannot be recognized.

             

            The demo document  64188119658.pdf

             

             

            Any assistance you can render me will be appreciated.

            • 3. Re: The document has two digital signatures, why see only one
              zhangl15965901 Level 1

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              • 4. Re: The document has two digital signatures, why see only one
                zhangl15965901 Level 1

                Can someone tell me what's wrong with the document?

                • 5. Re: The document has two digital signatures, why see only one
                  margueritek Level 2

                  Without going into a detailed analysis, I would conjecture that the second signature incremental file section is not properly formed. The PDF spec says that the last line of a file must be %%EOF, and Each line shall be terminated by an end-of-line (EOL) marker, which may be a CARRIAGE RETURN (0Dh), a LINE FEED (0Ah), or both. In this file, the %%EOF at the end of the first section is followed immediately by an object in the incremental save section (1 0 obj) which deleted the EOL at the end of the first section. I notice that if I "Enable Editing" of the file, the second signature appearance disappears.

                   

                  You might also have words with the ShenZhen Certificate Authority, since they are still using SHA1, when that has been deprecated for several years in favor of SHA256. And, I expect, their certificates are also still malformed (using BER encoding rather than DER encoding).