Q: When looking at a digital signature validation status dialog, I see “The signature contains a timestamp from a Timestamp Authority that is not trusted” message. What is this message and how can I solve it?

A: Timestamps are signed just as documents are signed. For a timestamp signature to be valid, you must have trusted the Timestamp Authority that signed the timestamp.

To view details about the Timestamp Authority for a given signature and to trust it, follow the steps below:

  • Click Signature tab on left panel
  • Right click on the Signature -> Details
  • When Signature Validation Status dialog displays, click Details
  • Change to Timestamp Authority tab
  • Click Trust Certificate¬†button if you decide to trust this TimeStamp Authority and select OK