I have a new (Belgian) eID. But the certificates were not longer recognised. So I re-Installed Adobe Acrobat Reader DC. The certificate for signature is now accepted and tested (5 green check marks). But at the end of the process to sign a .pdf document the error appears: (dutch:) “Fout aangetroffen tijdens ondertekenen: Niet-ondersteund algoritme” (free translated:)”Error encountered while signing: Unsupported algorithm”. What can I do? Please answer.
I'm having the same issue, Did you find a solution yet?
Contact the authority that issued this signature profile and ask for exact instructions on how to use it.
It's also recommended to go to the application's Preferences (via the Edit menu on Windows or the Reader app menu on a Mac), then to Trust Manager and click both Update Now buttons there.
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The problem is solved. Solution : configure Acrobat Reader without pkcs#11 module.
If this module has already been linked, the already linked module must therefore be uncoupled again.
After unlinking, restart Acrobat Reader and try signing again.
BELGIUM uses software called eID middleware that communicates with the card for Windows. In the past Acrobat Reader could not use this middleware and Acrobat Reader needed the pkcs11 module to do the communication with the card. Recently, ADOBE has made the necessary changes so that READER can work with the middleware.
The pkcs11 module has now basically become optional within Acrobat Reader.