What Is a Passkey and Should You Use One?
What Is a Passkey?
A passkey is a modern, passwordless way to sign in to accounts, designed to replace passwords with something more secure and convenient. Instead of typing a password, you authenticate with your device — using your fingerprint, face, or device PIN — and cryptography handles the rest. Passkeys are widely regarded as the future of authentication, offering both stronger security and a better experience than passwords.
Major technology companies have adopted passkeys, and they are increasingly available across services. Understanding passkeys helps you take advantage of this significant improvement in account security.
How Passkeys Work
Passkeys use public-key cryptography:
1. When you create a passkey for an account, your device generates a cryptographic key pair — a private key (stored securely on your device) and a public key (stored by the service).
2. The private key never leaves your device and is protected by your device's security (biometrics or PIN).
3. When you sign in, the service sends a challenge that your device answers using the private key, proving your identity without ever transmitting a secret that could be stolen.
4. You authorize this with your fingerprint, face, or device PIN.
The result: you sign in by simply verifying yourself on your device, with no password to remember, type, or have stolen.
Why Passkeys Are More Secure
Nothing to steal in transit: Unlike passwords, no secret is transmitted that could be intercepted. The private key stays on your device.
Phishing-resistant: Passkeys are tied to the specific website they were created for and will not work on fraudulent sites. This makes them inherently resistant to phishing — a major advantage over passwords.
No password to breach: Since there is no password stored by the service, password breaches become irrelevant. A breached service cannot leak a passkey's private key (which it never had).
No weak or reused passwords: Passkeys eliminate the problems of weak, reused, and guessable passwords entirely.
No credential stuffing: With no password to steal and reuse, credential stuffing attacks fail.
Why Passkeys Are More Convenient
Nothing to remember: No passwords to create, remember, or manage.
Fast sign-in: Authenticate with a fingerprint or face in seconds.
No typing: No fumbling with complex passwords.
Cross-device sync: Passkeys can sync across your devices through your platform (Apple, Google, Microsoft) or password manager.
Passkeys vs Passwords
Passwords: Something you know, transmitted to log in, vulnerable to phishing, breaches, weak choices, and reuse.
Passkeys: Something tied to your device and verified with biometrics, never transmitted, resistant to phishing and breaches, with nothing weak to choose or reuse.
Passkeys address nearly every weakness of passwords, which is why they represent such a significant improvement.
How to Start Using Passkeys
Check availability: Many major services now offer passkeys. Look in your account security settings for a passkey option.
Create passkeys for important accounts: Start with accounts that support passkeys, prioritizing important ones.
Use your platform or password manager: Apple, Google, and Microsoft support passkeys natively, syncing across their ecosystems. Many password managers also support passkeys, offering cross-platform syncing.
Keep a backup method: While transitioning, maintain backup access methods in case you need them.
The Transition Period
We are in a transition from passwords to passkeys:
Not universal yet: Not all services support passkeys, so passwords remain necessary for many accounts. Continue using a password manager for password-based accounts.
Growing adoption: Passkey support is expanding rapidly, so more of your accounts will offer it over time.
Hybrid approach: For now, use passkeys where available and strong unique passwords (via a password manager) elsewhere. Your password manager increasingly manages both.
Passkeys and Your Email
Your email account — the key to your digital life — is an excellent candidate for a passkey if your provider supports it, adding phishing-resistant security to your most important account. Combined with using Temp90 for non-essential registrations (limiting your email's exposure) and passkeys or strong 2FA for access, you protect your email comprehensively.
Frequently Asked Questions
Are passkeys really more secure than passwords?
Yes, significantly. Passkeys are phishing-resistant (they will not work on fake sites), cannot be stolen in transit or breached from a service (no shared secret exists), and eliminate weak and reused password problems. They address nearly every password weakness, making them substantially more secure than even strong passwords.
What happens to my passkey if I lose my device?
Passkeys typically sync across your devices through your platform (Apple, Google, Microsoft) or password manager, so losing one device does not lock you out if you have others or synced backups. This is why using a platform or password manager that syncs passkeys, and maintaining backup access methods, is important. Set up syncing and backups to prevent lockout.
Do passkeys replace my password manager?
Not yet. We are in a transition period where many services still use passwords, so a password manager remains valuable for those accounts. Increasingly, password managers also store and sync passkeys, so your password manager can manage both passwords and passkeys during the transition, becoming a unified tool for all your authentication.
Conclusion
Passkeys represent the future of authentication, replacing passwords with a method that is both more secure and more convenient. By using cryptography and your device's biometrics, passkeys eliminate the core weaknesses of passwords — they are phishing-resistant, cannot be breached or stolen in transit, and remove the problems of weak and reused passwords entirely, all while making sign-in faster and eliminating the need to remember anything. As passkey support expands across services, adopting them for your accounts, especially important ones like email, significantly strengthens your security. During the current transition, use passkeys where available and strong unique passwords via a password manager elsewhere, embracing this major improvement in account security as it becomes the new standard.