"the credential selected for signing is invalid"

New Here ,
May 20, 2016

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I am a Mac user running on OS X El Capitán vers. 10.11.14 who just installed the Adobe Acrobat Reader DC program so that I could sign ACA (Autoridad de Certificación de la Abogacía -Spain-)  documents. When I attempt to sign these documents using my ACA certificated (common access card) via my smart card reader, I get the error message: "the credential selected for signing is invalid". My ACA credentials should not be the issue, as I've used it on work computers without signature problems, so I'm thinking that the issue i'm getting on my Mac is related to my current Adobe settings. Any advice or assistance in regards to signing documents with my ACA card would be greatly appreciated. Hopefully, I can get some real assistance instead of a generic copy and paste "trouble shooting" response. Thank you

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General troubleshooting, Security digital signatures and esignatures

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Adobe Employee ,
May 20, 2016

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HI susanag95901292

Please try the steps given below :

1.Select the Acrobat > Preferences menu item

2.Select Signatures from the Categories list box

3.Click the More button in the Verification group box (second from the top)

4.Deselect the Require certificate revocation checking to succeed whenever possible checkbox

5.Click the OK button on the Signature Verification Preferences dialog

6.Click the OK button on the Preferences dialog

Try to sign and see what happens.

Please let me know how t goes

Regards,

Yatharth .

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New Here ,
Aug 04, 2016

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Hello,

Different user, same issue. I tried this and I still have the problem. Is there a way to debug exactly what is invalid? According the Keychain, my digital cert from my CAC is valid and not expired.

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New Here ,
Aug 05, 2016

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Also different user, same issue.  The answer is no help.  One of my Macs with adobe 10 pro that i did not allow to update the digital signing certificates, within adobe, still allows me to digitally sign with my CAC.  My other two computers, macbook air with adobe DC pro and a macbook pro with adobe X pro, I allowed the update and cannot digitally sign pdfs.  What changes did the update make to my computer that I can undo to see if that is the problem.  This is effecting my work on a daily basis as I have to get someone else to sign documents for me.  Please HELP.

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Adobe Employee ,
Aug 05, 2016

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Hello,

Would you follow "post number 3" suggestions from this thread: Re: Digital Signature on Adobe Acrobat Reader DC

make sure you put E-card software module somewhere you can browse easily.

Regards,

Tariq Dar.

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New Here ,
Aug 11, 2016

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I'm having the same issue, but both fix actions above did not work.  Signing worked for a long time, but about a week ago is now giving me the "the credential selected for signing is invalid" error.  I manage IT for my organization and it is starting to happen on their machines too.   I really need a fix action since it is now affecting our business processes. 

I'm using a MacBook running 10.11.6 with the latest version of adobe reader.  I'm using a US Government CAC with Centrify Express for Smart Card agent.

Thanks so much,

Trek

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New Here ,
Aug 12, 2016

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the same here...

pdf signet works, but lacks timestamp feature which i need...

so i don't see why the all-mighty DC has problem with our valid credentials...

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Explorer ,
Aug 18, 2016

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Come on Adobe - we're having the same problem with Acrobat Pro and PIV cards. Basically this is the only function justifying this product on my systems so while you may think this is a problem with a small feature from my perspective the entire application is broken.

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New Here ,
Aug 18, 2016

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Having the same issue; can't sign anything using my Common Access Card. Tried both this remedy and the one referred to on the other post with no avail. This issue is preventing me from working from my personal computer (MacBook Pro Version 10.11.6 OS X El Capitan)

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New Here ,
Aug 23, 2016

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I have to the same issue. I still can't sign with my military CAC and its causing a lot of headache. I am required by the military to sign documents with my CAC card and am unable to at this time. Is there any update on this issue? (MacBook Pro Version 10.11.6 OS X El Capitan).

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Adobe Employee ,
Aug 23, 2016

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Hi all,

You may try this workaround suggested by one of the user in post # 16 here : 10.11.6 CAC signing not working with 11.0.17 Acrobat

Thank You,

Shivam

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New Here ,
Aug 23, 2016

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I tried, however, I am fairly Tech savvy but not THAT Tech savvy....

1) How do I verify permissions? The only thing I can do is click on Get Info for /Library/CACKey/libcackey.dylib and allow read and white permissions. I have no idea how to verify -rwxr-xr-x (755) owned by root?

2) Nowhere in Adobe Reader DC, open Preferences, then go to Signatures --> Identities & Trusted Certificates --> More... could I find "PKCS#11 Modules and Tokens" or anything after that.

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Explorer ,
Aug 24, 2016

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1) Open a Terminal (click spotlight and type terminal)

in the terminal type:

ls -lart path_to_your_lib

That will list all the files in that directory and their permissions post that back if you are unsure. I actually don't think that the execute permissions are required (at least not with Centrify)

Look at that other thread mentioned above for the paths it depends on what smart card middleware you are running. My posts have the path for where Centrify is installed (note I don't think the necessary libraries are included with Centrify Express) other posted for libCAC, I've never used that one so I don't personally know the paths. It may take some searching around you may want to watch a basic video on navigating a unix filesystem if you are not familiar with using a terminal and the cd and ls commands.

2) Open Adobe Acrobat Reader DC

In the top menu (Where it says Acrobat Read) click preferences

Select Signatures in the Preferences window

Under Identities & Trusted Certificates click the MORE button.

The PKCS#11... is in this window when you click it you get the option to "Attach Module" on the top.

Screen Shot 2016-08-24 at 5.25.57 PM.png

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New Here ,
Aug 24, 2016

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Dude... what? Apparently I am not in my element here. I have no idea what you just wrote, you might as well be speaking Russian to me.

I don't know how to open a terminal nor "spotlight". Furthermore, I don't know what Centrify is either.

Once again, PKCS#11 does not show up in Signatures... AT ALL... ANYWHERE.

Im just a normal guy trying to use my CAC card with Adobe PDF. It used to work, now it doesn't. I think its related to this "update"?

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Explorer ,
Aug 25, 2016

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You are going to have to help yourself a little here since somebody can't walk up to your computer and fix it for you.

Try google...

"mac spotlight"

"mac terminal"

both bring up links that will help you understand what I'm talking about.

Are you able to find the screen I included above? Send us a screen shot of it.

google "mac screenshot"

At some point did you install some software on your mac for your CAC card or did it use to just work with Reader?

For general education on getting the CAC to work check out

MilitaryCAC's Mac OS X support landing page

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New Here ,
Dec 23, 2020

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I found it!

This "the credential selected for signing is invalid" message appears when you use a trusted certificate as a trusted root. Probably because Adobe finds something wrong in the trust chain.

Just by *disabling* the checkboxes below the message disappears and digitally signing works:

Screen Shot 2020-12-23 at 10.57.27 PM.png

Enjoy it

 

 

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