13 Replies Latest reply on Nov 7, 2017 2:02 AM by Mauro Giovetti

    PDF Signing Error - Your signature device does not support the required hashing algorithm SHA256

    rickfray

      We've been receiving calls to our helpdesk recently with users seeing an error when signing a PDF file: "Your signature device does not support the required hashing algorithm SHA256. Do you want to continue using the deprecated SHA1 algorithm or cancel the signature?"  The user can still sign the PDF but gets the error so more of an annoyance.

       

      The timing of this error appears to coincide with an update of Acrobat Reader to v11.0.20 on Win 7, and Acrobat DC to v15.6.30306 on Win 10 machines.  According to Adobe's website, these updates came out on 4/11/17.

       

      I've not found any specific reference on Adobe's site to this error.  The SHA1 vs. SHA256 on the signature hints at possibly an out of date driver issue based on some googling I've done but why that would start occurring based on an updated software version is odd.  Any ideas?  Anyone else seeing this? Thanks

       

      Rick