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

What you share and how you share it Manage privacy in Xbox apps Control how you play Learn about Xbox settings for online safety and privacy How to manage your activity feed and privacy

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 change your gamerpic, including how to upload a customized image for your profile from your Xbox console.

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 ...

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

了解如何在您的 Xbox 設定檔和 [Microsoft 帳戶] 中變更個人資訊，例如付款選項和設定檔詳細資料。

Xbox Support 提供 Xbox、Game Pass 及帳單問題的協助，並在社群中取得建議與客戶服務。

In Outlook, you can create one or more personalized signatures for your email messages. Your signature can include text, links, pictures, and images (such as your handwritten signature or a logo).