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

了解如何关闭双重验证。 双重验证是一项可选的安全功能，通过使用两种形式的身份，即密码和联系方式（也称为安全信息），这样别人更难进入您的 Microsoft 帐户。

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

See how to view the details for signatures and certificates.

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

The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

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.

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Learn how to identify and open encrypted and protected emails no matter what email client you're using.

Find out why you are being asked to give parental consent before you can play Epic Game titles.