What Are Passkeys?

What Are Passkeys?

Passkeys are a newer, passwordless way to sign in to accounts that is more secure and convenient than traditional passwords. Instead of typing a password, you authenticate using your device and something like your fingerprint, face, or device PIN. Passkeys are designed to resist phishing and eliminate many password problems. This article explains what passkeys are, how they work, and why they are more secure, in plain terms.

What Passkeys Are

Passkeys, in plain terms:

A passwordless sign-in method: Passkeys let you sign in to accounts without a traditional password, using your device and a biometric (fingerprint or face) or device PIN instead.

Based on strong cryptography: Passkeys use public-key cryptography (the same kind of strong technology behind security keys) to authenticate you securely.

Designed to replace passwords: They aim to replace passwords with something more secure and convenient, addressing many of passwords' weaknesses.

How Passkeys Work

The basic mechanism (without the technical depth):

A key pair: When you create a passkey for an account, your device generates a cryptographic key pair — a private key (kept securely on your device) and a public key (stored by the service).

The private key stays on your device: The private key never leaves your device and is not shared with the service, so there is no password for a service to leak.

Authenticating with your device: To sign in, your device uses the private key to prove your identity to the service, and you authorize this with your biometric (fingerprint/face) or device PIN.

No password to type or steal: There is no password to type, remember, reuse, or be stolen — your device and biometric/PIN handle authentication securely.

Why Passkeys Are More Secure

Passkeys address major password weaknesses:

Resistant to phishing: Passkeys are designed to resist phishing — they are tied to the legitimate site and cannot be easily tricked into authenticating to a fake site, unlike passwords you might enter on a phishing page. This is a major security advantage.

Nothing to leak in breaches: Since the private key stays on your device and there is no shared password, a service breach does not expose a password that could be stolen or reused.

No weak or reused passwords: Passkeys eliminate the problems of weak and reused passwords, since there is no password to choose poorly or reuse.

Strong by design: The underlying cryptography makes passkeys strong, without relying on you to create and manage strong passwords.

Convenient too: Passkeys are also more convenient — you sign in with your biometric or PIN, without typing or remembering passwords.

Using Passkeys

Practical points:

Increasingly supported: Passkeys are increasingly supported by services and devices, and you can often create a passkey for accounts that support them.

Tied to your devices: Passkeys are tied to your devices, and can often sync across your devices (through your platform/ecosystem) or be used across devices, so you can sign in on your devices.

Consider backup/recovery: Since passkeys are tied to your devices, understand the account's recovery options in case you lose access to your devices.

Can coexist with passwords: You can often use passkeys alongside existing sign-in methods as you transition.

Frequently Asked Questions

What are passkeys?

Passkeys are a newer, passwordless way to sign in to accounts that is more secure and convenient than traditional passwords. Instead of typing a password, you authenticate using your device and a biometric (fingerprint or face) or device PIN. Passkeys are based on public-key cryptography: when you create one, your device generates a key pair — a private key kept securely on your device and a public key stored by the service. To sign in, your device uses the private key to prove your identity, which you authorize with your biometric or PIN. There is no password to type, remember, reuse, or be stolen — making passkeys more secure and convenient than passwords.

Why are passkeys more secure than passwords?

Passkeys address major password weaknesses. They are designed to resist phishing — tied to the legitimate site, they cannot easily be tricked into authenticating to a fake phishing site, unlike a password you might enter on a fake login page (a major advantage). Since the private key stays on your device and there is no shared password, a service breach does not expose a password that could be stolen or reused. Passkeys also eliminate the problems of weak and reused passwords, since there is no password to choose poorly or reuse, and the underlying cryptography makes them strong by design. So passkeys remove the main ways passwords get compromised — phishing, breaches, and weak or reused passwords.

How do I use passkeys, and what if I lose my device?

Passkeys are increasingly supported by services and devices — for accounts that support them, you can often create a passkey and then sign in using your device with your biometric (fingerprint/face) or device PIN. Passkeys are tied to your devices and can often sync across your devices through your platform/ecosystem, so you can sign in on your devices. Since passkeys are tied to your devices, it is important to understand the account's recovery options in case you lose access to your devices — many accounts offer recovery methods, and passkeys often sync across your devices as a backup. You can usually use passkeys alongside existing sign-in methods as you transition, so you are not locked out during the change.

Conclusion

Passkeys are a newer, passwordless way to sign in to accounts that is more secure and convenient than traditional passwords — instead of typing a password, you authenticate using your device and a biometric (fingerprint or face) or device PIN. Passkeys use public-key cryptography: your device generates a key pair, keeping the private key securely on your device (never shared with the service) and giving the service the public key, then uses the private key to prove your identity when you authorize with your biometric or PIN — so there is no password to type, remember, reuse, or be stolen. This makes passkeys more secure than passwords: they resist phishing (tied to the legitimate site, they cannot easily be tricked into authenticating to a fake site), have nothing to leak in breaches (no shared password), eliminate weak and reused passwords, and are strong by design — while also being more convenient. Passkeys are increasingly supported, tied to your devices (often syncing across them), and can coexist with passwords as you transition (with recovery options in case you lose your devices). Understanding what passkeys are and why they are more secure helps you take advantage of this stronger, more convenient sign-in technology as it becomes more widely available.