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margueritek
Engaged
margueritek
Engaged
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‎Mar 04, 2021
08:02 AM
If the signature was really ECDSA it would have an ECDSA algorithm, which is not shown in your dump. It would also have a curve specifier, which again is not shown in your dump. You might ask where Acrobat would get the algorithm and curve for signing, if not from the final certificate in the chain (the one on the Smart Card). We know it is using the Smart Card certificate because the signature shows as Qualified, and the private key is on a Secure Signature Creation Device (the Smart Card). You need to get a real ECC certificate from ADIC.
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‎Mar 03, 2021
11:20 PM
The Smart Card certificate is the last one in the chain, and you can see that it is signed with SHA256 RSA. I don't know why Acrobat didn't complain about the format of the public key, which shows as EC PUBLIC (P-384) instead of RSA (2048 bit), but Acrobat never did extensive certificate format validation. If this were a real ECC certificate it would have an ECC signature algorithm with a curve specifier like this:
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‎Mar 03, 2021
02:53 PM
First of all, the smartcard certificate is RSA, not ECC. The EC Public key in the CMS is irrelevant, since its the public key in the cert that is used for validating.
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‎Feb 21, 2021
04:42 PM
The answer to that problem is to require the signers to be registered with Adobe. Then they will have to login with their credentials in order to review and sign.
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‎Feb 21, 2021
08:41 AM
The document you see on the screen is not a PDF. The appearance is generated internally by Adobe Sign. If the document is downloaded it will be password protected.
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‎Feb 12, 2021
10:01 AM
You need to contact the person who manages the FileOpen RightsServer or FileOpen RightsManager. This is a 3rd party protection system.
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‎Feb 12, 2021
08:40 AM
That message doesn't sound like any Acrobat DRM message. What system are you using for DRM? You might have better luck asking the provider.
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‎Feb 02, 2021
07:05 PM
1 Upvote
That's too bad. Unfortunately the corruption doesn't seem to be reversable. You'll need to find another copy somewhere. Perhaps next time make a second copy and mark it Read-only.
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‎Feb 02, 2021
03:45 PM
A digital signature prevents the file from being modified, since modification would invalidate the signature. So you can't "combine" files with digital signatures. What you can do is place the files in a portfolio within an enclosing PDF.
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‎Feb 02, 2021
03:26 PM
The file is truncated after the first 87MB, It doesn't have an xref table or catalog (or page table). There is not enough information left to recreate the PDF.
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‎Jan 13, 2021
06:11 PM
I don't believe Adobe Reader on the iPhone is equipped to handle certificate encryption. Certainly, Outlook and other PDF readers are not.
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‎Jan 04, 2021
09:16 AM
PDF has had a native, embedded, Sound annotation since Acrobat 3. Though Adobe never released an authoring tool for it. I think it is going to be removed in PDF 2.0.
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‎Dec 08, 2020
09:52 AM
If you are using AdobeSign, you take the signed document and add it as a file attachment to a cover page you create. Then file the cover page.
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‎Dec 07, 2020
03:33 PM
It's the other way around. The cover document contains (as a file attachment) the document to be signed. The user opens the attached file, fills in the form, and signs it. The signed file replaces the attachment (by default), so that saving the cover file, with the attached signed file, is the file you get back. Accounting fields are in the cover document (not the signed file) so you can fill those out when you get the package back. Think of the cover file as similar to a FAX cover page and routing slip.
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‎Dec 07, 2020
11:39 AM
The cover sheet can be any PDF you choose or create. Security envelope is a built-in PDF that looks like an envelope.
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‎Dec 05, 2020
09:45 AM
AdobeSign does not preserve attachments. What I suggested earlier is to create a cover document (think of a file folder) that contains the signed document as an attachment. The cover document could have the additional fields that need to be filled in for filing and audit. The cover document does not need to be signed or encrypted, though it could be if you like.
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‎Dec 02, 2020
08:19 AM
It's possible to sign with an invisible signature. Then, the only indication of signing is in the signature panel.
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‎Dec 02, 2020
08:17 AM
The final document you get from AdobeSign cannot be modified. You need to make a "cover" PDF and include the signed file as an attachment. The cover PDF can have any fields you like. Take a look at the "Security Envelope" option in Acrobat.
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‎Nov 17, 2020
09:57 AM
1 Upvote
The last time I looked, the Certifying signature did have a trusted timestamp, but did not have LTV. Some countries use a different (non-Adobe) timestamp service, and I can't give an opinion about those. You can't add LTV because the document is certified "No Changes Allowed". You could ask Adobe to include LTV when certifying the document. If there is truly not a trusted timestamp, file a bug report.
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‎Nov 16, 2020
02:24 PM
I think LTV (or the lack of it) is independent of time stamp server configuration.
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‎Nov 16, 2020
01:11 PM
I believe the AdobeSign signature contains a trusted timestamp, but the LTV information (certificate chains, revocation information) is not included in the PDF.
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‎Oct 20, 2020
02:25 PM
Could you please expand the details of the SmartCard certificate. I would like to see which Elliptic Curve was specified.
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‎Oct 11, 2020
05:47 PM
1 Upvote
Since Docusign is creating the PDF (not Adobe), your question should really be directed to Docusign.
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‎Oct 06, 2020
09:56 AM
The only thing that can control permissions if a PDF is not otherwise encrypted (e.g. with a Password) is the SaveAs Reader Extended operation, which is actually a digital signature with some extended user rights that are made available if the document is opened in Reader. Because the Reader Extended option (a Perms dictionary in the Document Catalog containing UR entries) is a digital signature, some operations associated with digital signatures are not allowed. These include Changing the Document itself. Most Reader Extended privileges have been granted by default in the latest Reader, so saving with Reader Extended is no longer required.
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‎Sep 24, 2020
10:59 PM
It used to be that Acrobat would try to at least open (for reading) anything, even if there were errors. It's part of the Internet motto (Postel's law): "Be conservative in what you do, be liberal in what you accept from others". I suggest opening a bug with Acrobat to get them back on track.
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‎Sep 15, 2020
07:56 AM
Use Adobe Sign. Digital signatures are supported, and the document can be signed in any order.
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‎Sep 06, 2020
11:07 AM
While Adobe Sign delivers the signed documents as PDF, it accepts Word documents as input. So you could author your templates in Word.
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‎Aug 31, 2020
11:06 PM
1 Upvote
Was this actually signed in Acrobat, with an Acrobat signature method? If the SigFlags entry in the AcroForm dictionary is not set properly (bit position 1 set) Acrobat/Reader will think there are no signatures, and none will be displayed. 3rd party previewers don't look at that bit.
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‎Aug 28, 2020
10:08 AM
All the signatures need to be applied via Adobe Sign. So you create digital signature fields for yourself and the other user, then let Adobe Sign send the document to you for signing, and to the other user for signing. Adobe Sign needs to modify the PDF in a number of ways, so pre-signing doesn't work.
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‎Aug 03, 2020
09:22 AM
ECDSA certs acceptable to Acrobat must be based on one of a few named curves. What curve is your certificate using?
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