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

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

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Learn how to prevent unauthorised purchases on your Xbox by creating Microsoft accounts for every person who uses that console.

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

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.

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.

What are passkeys? Passkeys are a replacement for your password. With passkeys, you can sign into your Microsoft personal account or your work/school account using your face, fingerprint, or PIN. Signing in with a passkey is simple and fast and helps protect you against phishing attacks. Passkeys are supported on desktop and mobile browsers (mobile app support is coming soon). You can use ...

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public ...

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