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To digitally sign an Office document, you must have a current (not expired) digital certificate. Digital 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.
Certificates are issued by a certification authority, and like a driver’s license, can be revoked. A certificate is usually valid for a year, after which, the signer must renew, or get a new, signing certificate to establish identity.
You can view information about a digital signature, or the certificate that is used to create the digital signature, in Word, PowerPoint, and Excel. For more information on adding or removing digital signatures, see Add or remove a digital signature.
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. Tip: To use or test macro projects on your own computer, you can create your own self-signing certificate by using the Selfcert.exe tool.
To digitally sign an Office document, you must have a current (not expired) digital certificate. Digital 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.
Certificates are issued by a certification authority, and like a driver’s license, can be revoked. A certificate is usually valid for a year, after which, the signer must renew, or get a new, a signing certificate to establish identity.
Signing certificate To create a digital signature, you need a signing certificate, which proves identity. 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.
Before you decide that a publisher is reliable, you should know the identity of the publisher, and whether the publisher's credentials are valid. Office will notify you if the file you're opening has been signed with an invalid or expired certificate.
While working with add-ins, you may need to learn more about digital signatures and certificates, which authenticate an add-in, and trusted publishers, the software developers who often create add-ins.
Trusted documents are files that have been marked as trusted by enabling active content in them. Active content (macros, ActiveX controls, data connections, and so on) opens without the Message Bar warning after you mark the file as trusted.
You can add a signature line to a document, add a graphic of your handwritten signature, or save a signature block as an AutoText building block. For information on adding a digital signature, see Add or remove a digital signature in Office files. Need more help? Want more options?