digitally signing PDF documents

Our IT are looking to use digital signatures on PDF files to prove their integrity and authenticity. They have asked for some assurances that they way they are configuring this process is secure and tamper free. Is there much that can go wrong with using digital certificates, what specific safeguards/best practices should we follow? Please keep answers low tech management freindly. Is there anything that can go wrong with using digital certificates, anyway they could be misconfigured?
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pma111Asked:
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Karl Heinz KremerCommented:
Digital certificates are pretty straight forward, and very safe.

You can either get a certificate from a certification authority that is known to Acrobat, then things will just work: You open a PDF and the viewer will be able to verify that the signature/certificate is valid. Or, you can build your own certification authority and just issue locally valid certificates. I would recommend to go with a "real" certificate, because you don't have to make sure that the certificate for the certification authority gets installed on every computer that will open these files (otherwise the PDF viewer will complain that it cannot validate the signature/certificate).
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