What is Secure Boot? Secure Boot is a security feature in Unified Extensible Firmware Interface (UEFI) based firmware that helps ensure that only trusted software runs during a device's boot (start) sequence. It works by verifying the digital signature of pre-boot software against a set of trusted digital certificates (also known as certificate authority or CA) stored in the device's firmware ...

For Android, you can get our beta app by joining our public Android Insiders group. For iOS, you'll first need to install TestFlight on your iOS device. You can find it here or in the App Store. Once TestFlight is installed, you can join from your device. You'll then be able to download and install our beta app via TestFlight.

为什么我会收到这条消息？ 许多运行 Windows 的设备都有受信任的平台模块 (TPM) 芯片集。 某些 TPM 芯片集存在安全漏洞，可能会影响操作系统安全性，这意味着 Windows 操作系统面临更大的风险。 你收到此消息是因为Microsoft已发布安全更新来解决需要下载和安装的漏洞。 此外，设备制造商发布了固件 ...

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

什么是安全启动？ 安全启动是统一可扩展固件接口中的一项安全功能， (基于 UEFI) 的固件，可帮助确保只有受信任的软件在设备的启动 (启动) 序列中运行。 它的工作原理是针对存储在设备固件中的一组受信任的数字证书 (（也称为证书颁发机构或 CA) ）验证预启动软件的数字签名。 作为行业标准 ...

Things to try if you are receiving an error when you try to validate your Microsoft Copilot license.

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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 The message looks common enough, and it says that money will be charged to your credit card or withdrawn from your bank account for the ...

To create an e-sign request, you’ll need to sign into your account with an available e-signature provider such as Adobe Sign or DocuSign. If you don't have account, it's easy to start a free trial or create an account. Choose the e-signature provider you'll use to create, send, and manage e-sign requests.