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In this tutorial, we learn how to sign a PDF document using a certificate-based digital signature in docHub. To start, download docHub from its original website for free. A digital ID is needed to sign with a certificate-based digital signature, containing personal information such as name, email, organization name, serial number, and expiration date. In docHub, digital IDs are used to sign or secure documents. Follow these steps: go to edit menu, select preferences, click signatures, choose digital IDs, click add ID. You can also add a digital ID file if you already have one from your organization. Enter your name, department, organization name, and email to create a new digital ID.