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To learn about digital signatures (also known as digital ID), what they can be used for, and how to them in Word, Excel, and PowerPoint, see All about digital signatures. Create a signature line in Word or Excel In the document or worksheet, place your pointer where you want to create a signature line. On the Insert tab, select Signature Line in the Text group. In the Signature Setup dialog ...

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Need help with an Xbox console, an Xbox game, or Xbox network? Find out how to get in touch with us.

详细了解什么是人肉搜索以及如何在 Xbox 服务上保护自己免受那些可能尝试使用你的私人信息的人员的伤害。

A popular tactic of criminals is the "fake order" scam. The way it works is that you get a message, usually in email or text, that appears to be a routine confirmation for an order. Of course, you never ordered whatever product or service it's confirming. The message looks common enough, and it says that money will be charged to your credit card or withdrawn from your bank account for the ...

Learn how to sign in and create app passwords for Microsoft apps and devices that don't support two-step verification.

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

Learn how to change your Xbox gamertag on the web, Xbox console, or Windows device while adhering to Xbox Community Standards.

What is Microsoft Authenticator lock? App Lock helps keep your one-time verification codes, app information, and app settings more secure. When App Lock is enabled, you'll be asked to authenticate using your device PIN or biometric every time you open Authenticator.