Thank you for reporting the issue.
We have introduced this change in Acrobat functionality and it is expected to warn you when you try to sign with SHA1 hash algorithm.
We have introduced this change as SHA1 has been royally broken and hash collision has been found. It is not safe to use SHA1 for signing any more. You can find the details of the issue if you click on Help in the warning dialogue.
Here's the link for you Applying a digital signature using the deprecated SHA1 algorithm warning message
That is why we advise our users to move to SHA256 hash algorithm. But your device does not support SHA256.
If you really want to continue signing with SHA1 you can go ahead with Continue in the warning dialogue and the functionality would remain the same for you.
Please let me know incase you have any issue.
Thanks and regards,
Hello, I have the same issue for Adobe XI (both Acrobat Pro and Reader). I tested in the same Windows 10, Smart card and smart card driver, Adobe DC can sign with SHA256, but Adobe XI can only sign with SHA1.
I follow the Applying a digital signature using the deprecated SHA1 algorithm warning message solutions but they are not worked for me. I also tested in Mac OS X, neither Adobe XI nor Adobe DC could sign with SHA256.
My smart card can sign with SHA256 in other programs.
Is there any idea for the issue?
anch'io mi trovo nella stessa situazione di paulinel45647625 e di tonyc947176.
La versione di Acrobat Professional XI è la 11.0.22
Sui PC con Windows 7 funziona tutto perfettamente, ma sui 2 PC con Windows 10 (gli unici con questo S.O.) si riesce a firmare nella sola modalità SHA1.
Inoltre non vengono nemmeno visualizzate (quindi inserite) le informazioni della Firma in formato testo, è possibile inserire solamente la firma in formato grafico.