When you send a digitally-signed macro or document, you also send your certificate and public key. Certificates are issued by a certification authority, and like a driver’s license, can be revoked.

In Certificate, select the certificate that you want to use. You'll only see those certificates that you've added to the keychain for your Mac OSX user account and those certificates that are valid for digital signing or encryption.

When you send a digitally-signed macro or document, you also send your certificate and public key. Certificates are issued by a certification authority, and like a driver’s license, can be revoked.

The certificate must be installed on the user's computer and associated with a private key. The key usage properties contained in the certificate must include either digitalSignature or nonRedpudiation values. The key usage defines what the certificate key should be used for.

If you plan to exchange digitally-signed documents together with other people, and you want the recipients of your documents to be able to verify the authenticity of your digital signature, you can obtain a digital certificate from a reputable third-party certificate authority (CA).

This article contains information about how to troubleshoot problems that affect the ability to sign in to Microsoft Office apps for Mac, iPad, iPhone, or iPod Touch.

The Signature Details dialog box displays certificate information such as the signer’s name in the Signing as box, and who issued the certificate. Open the file that contains the certificate you want to view.

This article describes how you can digitally sign a macro project on Windows by using a certificate. If you don't already have a digital certificate, you'll need to get one.

Learn how to install the Microsoft 365 Copilot mobile app on your iPhone or iPad and use the apps with Microsoft 365.

You will need to obtain a digital ID (Certificates) issued by an independent certification authority. Your organization, however, may have policies that require a different procedure.