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

Developers have made amazing games and content for the Xbox network. To protect customers and developers, we provide a safe and secure way to make purchases in the Microsoft Store. To maintain this security, Xbox monitors for instances of marketplace theft or solicitation from the Xbox community.

This article has guidance for: Organizations (enterprise, small business, and education) with IT-managed Windows devices and updates. Note: If you are an individual who owns a personal Windows device, please go to the article Windows devices for home users, businesses, and schools with Microsoft-managed updates.

A popular tactic of criminals is the "fake order" scam. The way it works is that you get a message, usually in email or text, that appears to be a routine confirmation for an order. Of course, you never ordered whatever product or service it's confirming. The message looks common enough, and it says that money will be charged to your credit card or withdrawn from your bank account for the ...

可以使用安全密钥作为组织中的无密码登录方法。 安全密钥是一种物理设备，它与唯一 PIN 一起使用以登录到工作或学校帐户。 由于安全密钥要求你拥有物理设备和只有你知道的内容，因此它被视为比用户名和密码更强大的验证方法。 使用安全密钥作为无密码身份验证方法目前以公共预览版提供 ...

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 protect your PC, identity, and data from tech support scams.

Provides information for avoiding and reporting Microsoft technical support scams.

Microsoft已颁发更新的证书，以确保 Windows 设备上的安全启动保护的连续性。 Microsoft将在大部分 Windows 设备上管理这些新证书的更新过程。 此外，我们还将为管理自己的设备更新的组织提供详细的指导。 重要说明 当 2011 CA 过期时，没有新 2023 证书的 Windows 设备无法再收到危害 Windows 启动安全性的预 ...

Learn what you can do if you're not receiving account aign-in verification codes.