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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Check the Xbox services, games, and apps for any service outages.

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

To install Authenticator on your iOS device Scan the QR code or download and install Authenticator from the Apple app store. Get the app

Note: This article uses a Windows device for demonstration purposes, but you can also register devices running iOS, Android, or macOS. What happens when you register your device While you're registering your device on your organization's network, the following actions will happen: Windows registers your device on your organization's network.

Signing your email messages with a digital ID helps to prove your identity and prevent message tampering.

Learn what types of controllers will work when cloud gaming using the Xbox app or web browser.

了解 Xbox Design Lab 的自訂控制器以及如何訂購符合您規格的控制器。

To create an e-sign request, you’ll need to sign into your account with an available e-signature provider such as Adobe Sign or DocuSign. If you don't have account, it's easy to start a free trial or create an account. Choose the e-signature provider you'll use to create, send, and manage e-sign requests.