什么是Passkeys，它们如何在Mac上工作？

Passkeys是苹果设备上替代密码的新型登录方式，其通过设备生成唯一数字密钥验证身份，提升安全性并简化登录流程。它们基于公钥加密技术，私钥保留在设备上，公钥用于服务验证，避免密码泄露或钓鱼风险。在Mac上使用时，创建过程包括：在支持的服务注册时选择passkey选项，并通过Touch ID或Mac密码确认；创建后自动同步至iCloud钥匙串，可在所有苹果设备间同步。登录时点击“使用Passkey登录”按钮并认证即可，适用于在线和离线场景。管理方面，可在系统设置的密码部分查看、删除passkey，确保账户安全。若更换设备，只需用Apple ID登录新设备并验证现有passkey即可同步，但跨平台迁移需服务支持。总体而言，passkeys提供更安全便捷的体验，尽管目前支持度仍在扩展中。

Passkeys are a new way to sign in to apps and websites without using passwords. Instead of typing a password, your Mac creates a unique digital key that’s stored securely on your device. When you log in, it uses that key to verify who you are—no need to remember or enter a password.

They’re built using public-key cryptography, which means there's a private key (stays on your device and never gets sent anywhere) and a public key (shared with the service you're logging into). This makes passkeys more secure than traditional passwords since there’s no password to steal or phish.

Here’s how they work day-to-day on a Mac:

Setting Up Passkeys on Your Mac

To create a passkey, you’ll usually do it when signing up for a service that supports them. The process is simple:

• Go to the website or app and choose to create an account.
• When prompted for a password, look for the option to use a passkey instead.
• Confirm with Touch ID or your Mac’s user password.

Once created, the passkey is saved in your iCloud Keychain, so it syncs across your Apple devices automatically. If you have an iPhone, you can even use it to unlock your Mac or other devices.

Things to keep in mind:

• Make sure iCloud Keychain is turned on in your settings.
• You might need to use two-factor authentication for your Apple ID to enable syncing.

Using Passkeys to Log In

After setting up a passkey, logging in becomes much smoother:

• Go to the login screen of the website or app.
• Click the “Sign in with Passkey” button.
• Authenticate with Touch ID or your device password.

This works both online and offline, and because it’s tied to your device, phishing attacks become far less of a threat.

A few things you might notice:

• Some services may still offer a backup password option—this is good to have just in case.
• On some sites, the passkey option might appear as a small icon next to the username field.

Managing and Deleting Passkeys

You don’t interact with passkeys directly like passwords, but you can manage them in System Settings:

• Open System Settings > Passwords, then click Passkeys.
• Here, you can view all saved passkeys and delete any you no longer need.

If you lose access to your device or stop using a service, deleting old passkeys helps keep your accounts clean and secure.

Also, if you share your Mac with someone else, each user will have their own set of passkeys. So one person’s sign-in won’t interfere with another’s.

What Happens If You Switch Devices?

Since passkeys sync through iCloud Keychain, switching devices is pretty seamless. Just sign in with your Apple ID on the new device, authenticate with your existing passkey, and you’re good to go.

One thing to note: if you’re moving from a non-Apple device to a Mac, not all passkeys will transfer unless they were created with cross-platform support enabled.

That’s basically how passkeys work on a Mac. They’re designed to be secure, easy to use, and mostly invisible once set up. Not everything supports them yet, but adoption is growing fast.

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