什麼是Passkeys，它們如何在Mac上工作？

Passkeys是蘋果設備上替代密碼的新型登錄方式，其通過設備生成唯一數字密鑰驗證身份，提升安全性並簡化登錄流程。它們基於公鑰加密技術，私鑰保留在設備上，公鑰用於服務驗證，避免密碼洩露或釣魚風險。在Mac上使用時，創建過程包括：在支持的服務註冊時選擇passkey選項，並通過Touch ID或Mac密碼確認；創建後自動同步至iCloud鑰匙串，可在所有蘋果設備間同步。登錄時點擊“使用Passkey登錄”按鈕並認證即可，適用於在線和離線場景。管理方面，可在系統設置的密碼部分查看、刪除passkey，確保賬戶安全。若更換設備，只需用Apple ID登錄新設備並驗證現有passkey即可同步，但跨平台遷移需服務支持。總體而言，passkeys提供更安全便捷的體驗，儘管目前支持度仍在擴展中。

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 tr​​ansfer 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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