Adobe reader x: signature digest algorithm

Hi,
I have created a pdf with Adobe Acrobat, with the signing attribute on and it has an empty signature field.
If I sign this document using a brand new self-signed windows digital ID Adobe Reader uses as signing algorithm SHA256, if I use (via PKCS11) a certificate contanied in a smartcard, the hash algorithm used is SHA1... for the italian signature law the hash signing alg must be SHA256.
My settings in Edit - Preferences - Security - Advanced Preferences - Creation is:
Default signature Signing Format: CAdES Equivalent
(but it acts the same with PKCS#7 Detached)
Is there a way to always use SHA256 in signing?

Could you please try turning off reader X protected mode and check if you continue to see the problem? You could turn off protected mode using following steps:
1. Launch Reader X and select Edit->Preferences...
2. Select General from left navigation
3. Under application startup uncheck "Enable Protected Mode at Startup"
Note: You should switch "ON" protected mode after verifying the problem. Purpose of Reader X Protected Mode is to keep your system safe from PDF based exploits and keeping protected mode OFF will leave your system vulnerable.

Similar Messages

Adobe Reader XI Signature and touch monitor issue

Hi. I am trying to utilize signature feature on this new Adobe Reader XI. When I first tried this at a local Microsoft Store, it worked beautifully and I immediately downloaded the software on my computer (Windows 7; touch screen computer). Upon installing them, however, I cannot get my finger to sign just as I was able to do before at the Store. It just won't let me sign on the box (but I was able to do it using a mouse). I thought it is perhaps a Windows issue and I tried it with my friend's Windows 8 computer. However, same problem occurs. What would be a possible solution to this issue? Thank you very much!!!!

Use the forum for Adobe Reader.

I am unable to sign Adobe Reader 9 signature fields.

Hi,
I received a PDF that I need to sign digitally. However, when I try to sign the signature field, nothing happens. Specifically, when I click the field with my mouse, nothing happens.
In more detail:
1. I move my mouse over the field, and a dialog box appears saying "Unsigned signature field (Click to sign)".
2. I click the field, but nothing happens.
3. When I go to Document --> Sign --> and I view the options, all the options (such as "Sign Document" or "Apply Ink Signature") are grayed out. I have included an image to illustrate what I am saying.
It should be noted that I initially tried to do this with Adobe Reader 11. After that didn't work, I re-installed Adobe Reader 11 and tried again, but it still didn't work. Then I switched to Adobe Reader 9, and it doesn't work. Any thoughts on what's going on here?

In my quest to find out what's wrong, I also discovered that when I try to save any changes, a box appears saying: "Data typed into this form will not be saved. Adobe Reader can only save a blank copy of this form." Might the two issues be related?

Adobe Reader Digital Signature Plugin

Hello All,
We had developed a adobe plugin for digital signature through smart card. The plugin works fine for Adobe Professional. I would like to know the procedure how to make it work for Adobe Reader. I found a URL http://www.adobe.com/devnet/reader/ikla.html which says to buy a license. I'm confused over DRM and non-DRM agreement.
To make it clear, our company shall be distributing the smart card and the plugin in the enterprise market for digital signatures that need to work with both Adobe Professional and Adobe Reader. Our customers shall be probably using Adobe reader.
Can any one let me know the procedure to make reader plugin?
Regards,
Madhukar

Hi Gatis,
Check out the Security and Digital Signature Admin Guide athttp://learn.adobe.com/wiki/download/attachments/52658564/acrobat_reader_security_9x.pdf?v ersion=1
http://learn.adobe.com/wiki/download/attachments/52658564/acrobat_reader_security_9x.pdf?v ersion=1
Once you get the file open look at section 5.3.4.4
The folder path has to exist, but Acrobat will create the file if it's missing. For example, if you want to save the file to C:\LogFile\digSigLog.txt the folder LogFile would have to exist on the C drive, but the log file itself will get created if it's not there already.
When you type in the file path and name in the Edit Binary Value dialog in regedit, make sure you null terminate the string by typing a zero at the end of the hex data on the left side of the dialog. It will look like a dot on the right side, but it's not really a dot (a dot is 2E in hex).
Steve

How to apply for self-developed plug-in signatures licensing about Adobe Reader

Our company is doing something in the field of electronic certification industry, which uses Adobe reader to sign PDF files based on various signature algorithms. While, there is a problem that Adobe reader does not support PDF signature based on the signature algorithm of SM2. To solve the problem, we have developed an API file. And now, we can use the Adobe Professional version sign files Successfully, only by put the API file under the folder named Adobe plug-in, but not work well in Adobe Reader. According to the documentation, such as http://www.adobe.com/cn/devnet/reader/ikla.html and http://www.adobe..com/content/dam/Adobe/en/devnet/acrobat/pdfs/plugin_apps_developer_guide .pdf, in Adobe Acrobat Reader, a self-developed plug-in we have developed need to be signed or obtain the relevant certification by Adobe before use.
If we propose certification and licensing applications to Adobe to ask the possibility of obtaining permission for our plug-in, what are the specific processes and requirements we need to know? Any useful information, I would be grateful. (Including the information we need to provide, as well as the cost and the certification time, etc.)

I think you're more likely to get a reply over at the Acrobat SDK forum: Acrobat SDK

Change in certificate validation algorithm in Adobe Reader 10.1.2

Some experiments I have done with both Adobe Reader 10.1.1 and 10.1.2 show that their implemented algorithm vor validating the certificate of a signature is different:
In all versions of Adobe Reader up to and including 10.1.1 no revocation checking is performed for a certificate marked as a trust anchor.
In Adobe Reader 10.1.2 revocation checking is performed even if a certificate is marked as a trust anchor.
Since the latter behaviour is in conflict with international standards for certificate validation (RFC 5280, section 6.1), my questions are:
Has this shift in the implementation happened intentionally?
If yes, why?
/Gregor

Hi Jagriti,
sorry, it took some time to prepare things for this answer.
I have digged a bit deeper in my real world example: It uses a qualified EE certificate isssued by a German Trust Center supervised by the German Federal Net Agency (Bundesnetzagentur) - want I want to express here: It is not some self-signed anything, but a situation that will happen with almost each qualified EE certificate issued under German law.
You can find my real world example here, a PDF signed using such a qualified EE certificate (BTW: I cannot find a way to add files to my post, is there really no such mean in Adobe's forums?).
Additionally I have put together all certificates and CRLs depicted in the following graph into a ZIP-Archive, you can find it here.
Now, there are some awkward things with the structure of that PKI:
If you try to find a revocation status for Bundesnetzagentur's OCSP Service, you may get into a loop, since the signer certificate for that OCSP Service has a AIA certificate extension pointing to - well - the Bundesnetzagentur's OCSP Service (but this is not the problem I am facing at the moment - see below).
If you try to find a revocation status for the CRL issuer of Bundesnetzagentur's indirect CRL, you may face the same problem, since the CRL-DP certificate extension of the CRL issuer's certificate points to - well - the Bundesnetzagentur's indirect CRL (but this is still not the problem I am facing at the moment ;-).
The CRL-DP certificate extension (in all certificates shown in the graph above and depicted in blue) is missing the cRLIssuer field in the DistributionPoint, which is a MUST regarding to RFC 5280 if the DistributionPoint refers to an indirect CRL. Yes, and this is my problem at the moment - see below.
My current settings in Adobe Reader 10.1.2 are the following:
The Bundesnetzagentur's root certificate 12R-CA1:PN is marked as a trust anchor.
I am using a custom certificate preference to tell Adobe Reader to accept the OCSP responder signing certificate TC TrustCenter DIR 39:PN (cAuthorizedResponder set to 1).
Validation in my Adobe Reader 10.1.2 currently does the following:
Find a valid path for Test-Signaturdienst:PN ... fine.
Check revocation status for Test-Signaturdienst:PN ... fine (using the OCSP responder pointed to by the AIA of the certificate).
Check revocation status for TC TrustCenter DIR39:PN ... fails (using the CRL-DP pointing to the Bundesnetzagentur's indirect CRL).
My question for the moment: Is there a chance to let Adobe Reader 10.1.2 accept Bundesnetzagentur's indirect CRL although the CRL-DP in TC Trustcenter DIR 39:PN is missing the cRLIssuer field?
My question for later: Is it an issue inside Adobe to support the validation of documents signed with a qualified certificate issued under German law despite the awkward construction of Bundesnetzagentur's PKI (Germany is a market with 80 million people)?
Best regards, Gregor

Using iText to generate a digital signature that can be signed in Adobe Reader

I am able to create a digital signature in a pdf using iText. Adobe Reader does not allow that digital signature to be signed. Everything I have been reading suggests that I need to enabe Reader Usage Rights, but that requires using Adobe Pro. I was hoping that I would only need Adobe Reader inorder to digitally sign the pdf, is that possible?

Not without the required rights...

How Can I stop signature fields disappearing on my IPAD Adobe Reader 11

Hi, I am using trial version of Adobe Acrobat XI pro. I have converted a Word document to PDF. I have added text fields, Java scripts to automatically add Todays date as default, Form Reset buttons and Signature fields. File is saved as standard save. All of the above is done in Windows 7 environment. On same computer, In Adobe Reader signature fields are visible although I do not have the means to test it. When the same File is emailed and opened on an IPAD using Adobe Reader 11.2, the signature fields are missing. I intend to have my users access the file (and 30 others like this) on an IPAD. Can someone advise how to resolve the missing signature field issue. It appears that Adobe do not help with such issues as it is not considered an installation issue.

Digital signatures are not supported on mobile versions of Adobe Reader. Other PDF viewers like Readdle's PDF Expert treat them like e-signature fields, allowing the user to draw/apply their drawn signature, but this is not the same as a digital signature. Adobe Reader for iOS allows you to add an e-signature, but it doesn't use digital signature fields for this feature. Instead, you tap the screen, choose the annotations icon, and then the signature icon.

Can you create an electronic signature in a PDF file using Adobe Reader 9

Hello all:
I am filling out an application that I opened using Adobe Reader 9.
It is a PDF document, and at the very bottom there is a field which is meant for my signature..
Is there away to sign this electronically?
Do I need to scan my signature and place it that field?
Can I sign with a pen tool with in Adobe Reader 9?
Or do I need to print, sign the document, scan my document, and then import as a completely different PDF file?
Thanks in advance!!

That depends.
Are they asking you to put a copy of your actual signature on there or are they asking for a "digital signature"?
They are different things.

How to create a digital signature in adobe reader

how to create a digital signature in adobe reader?

Adobe Reader Touch (Windows Store app with "modern" UI) does not support any types of signatures yet.
Digital Signatures with certificates
Electronic Signatures (that are legally enforceable)
Signature annotations (hand-writing annotations which may not be secure and legally enforceable)
Adobe Reader XI (traditional desktop app with classic UI) supports #1 and #3.
Adobe EchoSign supports #2.
Adobe Reader for iOS/Android supports #3.

Document setting prevent placing a signature using Adobe Reader

Created a statis pdf witha digital signature field in Adobe Livecycle designer, also tried in Acrobat PRO, saved as a PDF, when opening the file under Adobe Reader X or Adobe Reader 8 get sam eissue adobe reader will not allow the signature or document ot be changed, get a warning that saya "document setting prevent placing a signature using Adobe Reader"
Sorry I am new to Adobe, what does Reader want, I do not have this issue when I open the file under Acrobat PRO or Livecycle.
Thanks

This forum is only for discussions on the forums themselves. You may want trying to post your question in the Reader forum.

How do I change my security settings in Adobe Reader to allow me to add my electronic signature?

I am trying to fill out a job application that requires me to type my signature, but it will not enter. When I go to File-Properties-Security, it says signing is "Not Allowed". How can I change this to allow signing? Thanks you so much.

Not possible with Adobe Reader.

Adobe Reader XI 11.0.09 Update broke image signatures

I allowed my computer to download and install the latest Adobe Reader XI update, to version 11.0.09. Since doing that, I can no longer sign PDFs. Adobe Reader "forgot" my signature, and prompts me to create a new one, but gives me an error when I try to do so.
The steps I take: I click on Fill & Sign at the upper right. From the Fill & Sign Tools pane, I choose Place Signature. Since Adobe Reader has forgotten my signature, I am prompted by a dialog box that starts with How would you like to create your signature?. I tick the Use an image radio button, then click the Browse... button that appears below it. I choose my signature, which happens to be a BMP file, and click the Open button. Adobe Reader then gives me an error message: This file cannot be used to create a signature. Please select a different file and try again.
I tried converting my BMP file to a TIFF file, but that didn't help.
I need to be able to sign PDF documents again. Is this a bug waiting for a fix, or is there a work-around?
I badly need this feature back again.
Mark Lebowitz
Chicago, IL

Hi, thanks for your prompt responses.
I am a bit perplexed. I take it that, although I have the latest Adobe Reader XI (11.0.10) installed with the latest update 32 and I can open it and use it to read PDF's it is not the correct version for Vista ? As I said when I used the Firefox plug in check, which triggered this whole issue for me, and clicked the red button to update it took me to an Adobe update install page which only offered the 10.1.4 English UK for Windows download (Which you say is actually the correct version for Vista) but this did not complete because it said I have a more functional version already installed which I presume is the 11.0.10 version ?
Do I now need to download the Adobe Reader 'Full Download': Adobe Reader MUI 10.1 - Multiple Languages version 146.67 MB 6/8/2011 or just the Adobe Reader 10.1.4 update, although I may find that I just get the same result as I do using the Firefox update button, it does not complete and I am informed I have a more 'functional version' installed ? Again there are two options for these Updates on the Adobe download page 'All languages' and 'Multi lingual (MUI) installer' and I am not sure what the difference is or , more important, which to use and the Help>About Adobe Reader offers no clue.
Further advice appreciated as I am a bit flummoxed ! Thanks .

Digital Signatures with Adobe Reader

So i created an adobe form with acrobat 9 and sent it out for all to digitally sign. about half are getting an error when they try to sign it. "The credential selected for signature is invalid"
We are a government agency and use Common Access Cards (CAC) certificates to digitally sign with.
i was hoping someone out there could either point me to a good recource for adobe and digital signatures or to a possible fix.
now we have narrowed it down to the problem being with the specific machine. the user can digitally sign the document on another machine, but not on thier own machine. Also, no one else can sign the doc on thier machine either.
Thanks in advance!

issue still exists. ive been searching for some info on how adobe handles digital signatures, like what folders are created on the machine. im thinking maybe i can clear out the app data for acrobat or something. im at a loss at the moment.

In Adobe Reader 10.1.4 my signatures are valid, in version 11.0.10 they are not?

I have a PDF document with two signatures.
If I open it in Adobe Reader 10.1.4 the signatures are ok.
If I open the same document in Adobe Reader 11.0.10 the first signature is marked invalid: "Document has been altered or corrupted since it was signed".
Does anybody understand why this is?
I have the feeling this is a bug in Adobe Reader 11.
Thanks,
Corné
You can find the PDF here: WeTransfer

Can you please try repairing the application from the Control Panel.
Also, could you please let me know if this issue was happening with Reader 10.1.3 as well.

Adobe reader x: signature digest algorithm

Similar Messages

Maybe you are looking for