The certificate associated with the digital signature is issued to the signing publisher by a reputable certificate authority (CA). Important:В 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 driverвЂ™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 PowerPointДЄ 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 PowerPointДЄdd 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 Office programs: Word, Excel, and PowerPoint. Excel for Microsoft 365 Word for Microsoft 365 PowerPoint for Microsoft 365 Excel 2021 Word 2021 PowerPoint 2021 Excel 2019 Word 2019 PowerPoint 2019 Excel 2016 Word 2016 PowerPoint 2016 Excel 2013 Word 2013 PowerPoint 2013 Excel 2010 Word 2010 PowerPoint 2010 Excel 2007 Word 2007 PowerPoint 2007 Excel Starter 2010 Word Starter 2010 More.

Free digital signature for excel