Important: Signed documents, which have a valid time stamp, are considered to have valid signatures, regardless of the age, or revocation status, of the signing certificate. A certificate is usually valid for a year, after which, the signer must renew, or get a new, a signing certificate to establish identity.

Certificates are issued by a certification authority, and like a driver’s license, can be revoked.

When you send a digitally-signed macro or document, you also send your certificate and public key. Signing certificate To create a digital signature, you have to have a signing certificate, which proves identity. Signing certificate and certificate authority A signature confirms that the information originated from the signer and has not been altered. Remove invisible digital signatures from Word, Excel, or PowerPointĪ digital signature is an electronic, encrypted, stamp of authentication on digital information such as e-mail messages, macros, or electronic documents. Invisible digital signatures in Word, Excel, or PowerPointĪdd invisible digital signatures in Word, Excel, or PowerPoint Remove digital signatures from Word or Excel This article explains digital signatures (also known as digital ID), what they can be used for, and how you can use digital signatures in the following Microsoft 365 applications: Word, Excel, and PowerPoint.

How to digitally sign a word document