Obtain a digital certificate and create a digital signature
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.
Trusted documents - Microsoft Support
Jan 24, 2022 · What are trusted documents? Creating trusted documents. When you open a new file that has active content (data connections, macros, and so on) the Message Bar appears because active content may contain viruses and other security hazards that could harm your computer or your organization’s network.
Apply sensitivity labels to your files and email - Microsoft Support
Specific labels are then either recommended for, or applied automatically to files or emails containing certain kinds of information, like social security numbers, credit card numbers, or other sensitive information.
Digital signatures and certificates - Microsoft Support
A digital signature is an electronic, encrypted, stamp of authentication on digital information such as email messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered. The following is an example of a signature line. Top of Page.
Enable or disable ActiveX settings in Office files
In the Microsoft Office Security Options dialog box, select Enable content for this session for each ActiveX control. The following image is an example of the Security Warning area when ActiveX controls can be enabled for the duration of time that the file is open.
Sensitivity labels are automatically applied or recommended for …
Microsoft 365 can be configured to recommend or automatically apply a sensitivity label to a file or email if it includes sensitive corporate or personal information, such as social security numbers, credit card numbers, or bank account numbers.
Digitally sign your VBA macro project - Microsoft Support
Open Microsoft Edge. Enter edge://settings/privacy in the address bar. Scroll down to the Security section and select Manage certificates. Digitally sign a VBA macro project in Excel, PowerPoint, Publisher, Visio, Outlook, or Word. Open the file that contains the …
Active content types in your files - Microsoft Support
This article lists types of active content that can be blocked by the settings in Trust Center and which, when present, will cause the display of a message bar upon opening the document. When active content is blocked, a Security Warning appears.
Restrict changes to files in Excel - Microsoft Support
If you don't want content reviewers to accidentally change a Word document or an Excel spreadsheet, you can use formatting and editing restrictions. Note: To further restrict reviewers from making changes to your document or spreadsheet, you can make the file read-only or you can password protect it.
Protection and security in Excel - Microsoft Support
Protection and security in Excel. Excel gives you the ability to protect your work, whether it’s to prevent someone from opening a workbook without a password, granting Read-Only access to a workbook, or even just protecting a worksheet so you don’t inadvertently delete any formulas.
Manage workbook links - Microsoft Support
This article explains how to manage workbook links, including how to refresh and update them, how to fix broken links, and how to work with the new security warning feature. Security Warning about workbook links