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Learn all about games and apps for Xbox and get help with any problems you're having.

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

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

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 recover a hacked or compromised account, what to do next, and how to prevent your account from being compromised in the future.

Troubleshoot slow game or app downloads on Xbox One Account error occurs when signing in to Xbox network

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