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

Xbox Support ... Xbox Support

深入了解 Xbox 網路上可能發生與帳戶相關的違規。

Learn how to manage your Microsoft account security info and troubleshoot verification code issues.

注意 Microsoft Authenticator 無法 支援 PC 或 Mac，因為認證器應用程式是為智慧型手機設計，出於安全考量。 深入了解。 Microsoft 不再支援超過一年的 Authenticator 版本。 請隨時保持裝置更新。 中國用戶應閱讀 如何在中國下載及使用 Microsoft Authenticator。

Using Authenticator as a way to sign in If you have turned on passwordless, two-step, or multi-factor authentication for your account, use the following steps to sign-in: Go to the site where you want to sign in. Enter your username at the sign-in prompt and select Next. Select Send notification.

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 contains a link to a phishing ...

Microsoft Authenticator is a free app that helps you sign in to all your accounts without using a password - just use a fingerprint, face recognition, or a PIN. You can use Authenticator to sign in to your Microsoft personal, work, school or other accounts.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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