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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

了解如何在智慧型電視、Amazon Fire TV 或 VR 頭戴式裝置上設定 Xbox Cloud Gaming。 包括安裝 Xbox 應用程式、連線控制器以及使用 Game Pass 串流遊戲的步驟。

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 ...

See how to view the details for signatures and certificates.

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

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.

當您嘗試將遊戲或應用程式下載到 Windows 電腦時，看到以下錯誤碼： 0x80d03002

Xbox Support 提供有关 Xbox、Game Pass 和账单问题的帮助，并通过社区提供建议和客户服务。

Notes: If you don't see the security key option, it's possible that your organization doesn't allow you to use this option for verification. In this case, you'll need to choose another method or contact your organization's help desk for more assistance. Before you can register a security key, you must have at least one additional security verification method registered.

Learn how to fix error 0x80073CFD so you can play an Xbox Game Pass game on your Windows 10 device.