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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

若要获得 Xbox 主机的亲自服务，您可以访问Microsoft授权服务提供商，以获取由受信任的专家使用正版Microsoft更换部件执行的优质服务。

Xbox Support ... Xbox Support

How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.

Protect yourself from phishing Phishing (pronounced: fishing) is an attack that attempts to steal your money, or your identity, by getting you to reveal personal information -- such as credit card numbers, bank information, or passwords -- on websites that pretend to be legitimate. Cybercriminals typically pretend to be reputable companies, friends, or acquaintances in a fake message, which ...

Trying to sign you in Cancel

Use a ready signature template from a gallery to create your email signature in Outlook.

How to add a signature to your Word documents. You can also use the Signature Line command in Word to insert a line to show where to sign a document.

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

了解如何举报在 Xbox 上行为不当或发布不当内容的玩家。