This article explains how you can get or create a digital signature for use in Office documents. Here’s how it works in practice: A Microsoft 365 admin sets up the email signature rule in the Exchange admin center. To learn more about how to use them in Office documents, see Add or remove a digital signature in Office files. How does it work Mail flow rules used to set up an organization-wide email signatures are applied to messages when they are sent from your Microsoft 365 organization. What is a digital signature?Ī digital signature or ID is more commonly known as a digital certificate. To digitally sign an Office document, you must have a current (not expired) digital certificate. Set up the email signature as per this instruction. There are many commercial third-party certificate authorities from which you can either purchase a digital certificate or obtain a free digital certificate.ĭigital certificates are typically issued by a certificate authority (CA), which is a trusted third-party entity that issues digital certificates for use by other parties. Setting up an email signature using built-in Microsoft 365 features requires 2 basic steps: Prepare the email signature source code (you can use our Email Signature Generator for Microsoft 365 ). Many institutions, governments, and corporations can also issue their own certificates.Ī digital certificate is necessary for a digital signature because it provides the public key that can be used to validate the private key that is associated with a digital signature. Digital certificates make it possible for digital signatures to be used as a way to authenticate digital information. If you try to digitally sign an Office 2007 document without a digital certificate, the Get a Digital ID dialog box appears, and you are asked to select how you want to get your own digital signature.
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