See how to view the details for signatures and certificates.

什么是安全启动？ 安全启动是统一可扩展固件接口中的一项安全功能， (基于 UEFI) 的固件，可帮助确保只有受信任的软件在设备的启动 (启动) 序列中运行。 它的工作原理是针对存储在设备固件中的一组受信任的数字证书 (（也称为证书颁发机构或 CA) ）验证预启动软件的数字签名。 作为行业标准 ...

Last Updated: August 26, 2024 ISSUE Outlook Desktop blocks printing to PDF if Mandatory Labeling is enabled. This change is in all M365 channels beginning in January 2024. When you attempt to print to PDF the following Microsoft Information Protection errors are displayed: “ Your organization requires sensitivity labels for all files you create or edit, such as PDFs. Files you create from ...

Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

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.

About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

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Don't forget to include your license ID or agreement number, your contact phone number & email address so we can contact you. If you already have a volume licensing support case number, you may be in a location where you can phone the Volume Licensing support team.

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public ...

When you share copies of Microsoft 365 document files with clients or colleagues, it's a good idea to review the document for hidden data or personal information and remove it.