Passkeys are a modern authentication technology designed to let people sign in without typing a traditional password. Instead, a device creates a cryptographic credential that can be unlocked with a local screen lock, such as a fingerprint, face recognition, PIN, or device passcode.
What Are Passkeys?
A passkey is a credential based on public-key cryptography. During registration, a device creates a key pair. The private key remains protected on the user’s device or credential manager, while the corresponding public key is registered with the online service.
When the user signs in, the service sends a challenge. The device uses the protected private key to produce a cryptographic response. The service verifies that response with the public key. The private key itself is not sent to the website.
How Passkeys Work
- The user chooses to create a passkey for an account.
- The authenticator generates a cryptographic key pair.
- The public key is registered with the online service.
- The private key remains protected by the user’s authenticator or credential system.
- During sign-in, the service issues a challenge.
- The user unlocks the authenticator locally.
- The authenticator signs the challenge.
- The service verifies the signature using the registered public key.
Passkeys vs. Passwords
| Característica | Passwords | Passkeys |
|---|---|---|
| Secret shared with website | Yes, a password verifier is stored by the service | No private key is sent to the service |
| Phishing resistance | Limited | Designed to resist common phishing attacks |
| User memory required | Usually required | No password to remember |
| Credential reuse risk | High if users reuse passwords | Different cryptographic credentials can be used for accounts |
| Local unlock | Not normally required | Typically uses a device unlock method |
Why Passkeys Are More Resistant to Phishing
One important security property of passkeys is that authentication is cryptographically tied to the website or service for which the credential was created. A fake website cannot simply ask the user to type the passkey’s secret into a form because the private key is not exposed as a password.
This does not mean every account using a passkey is immune to every form of attack. Account recovery, compromised devices, malicious software, social engineering, and poorly designed authentication systems can still create risks.
Where Passkeys Are Stored
Depending on the platform and configuration, passkeys can be stored by a device’s built-in authenticator, a password manager, or another compatible credential provider. Some passkeys can synchronize across a user’s devices through an encrypted credential-management system.
Cross-device availability is useful because users may need to sign in from more than one phone or computer. The exact synchronization and recovery experience depends on the platform and credential provider.
What Technology Standards Power Passkeys?
Passkeys are based on established web and authentication standards, particularly WebAuthn and the FIDO2 ecosystem. The FIDO Alliance and W3C have helped establish standards that allow websites, browsers, operating systems, and authenticators to interoperate.
WebAuthn provides a web API that allows websites to register and use public-key credentials. FIDO authentication standards provide the broader framework for passwordless and phishing-resistant authentication.
Benefits of Passkeys
- No password to remember: Users authenticate with a device or credential manager instead of memorizing another secret.
- Phishing resistance: Passkeys use origin-bound public-key credentials designed to prevent common credential-phishing techniques.
- Reduced credential reuse: Users do not need to reuse passwords across multiple services.
- Strong cryptography: Authentication uses public-key cryptography rather than transmitting a password.
- Convenient sign-in: A local biometric or device PIN can make authentication quick.
- Better account security: Organizations can reduce dependence on weak or compromised passwords.
Are Passkeys the Same as Biometrics?
No. Biometrics such as fingerprints and facial recognition can be used to unlock an authenticator, but the biometric itself is not normally sent to the website as the authentication credential.
The biometric or device PIN typically unlocks the local credential. The website receives a cryptographic authentication result rather than the user’s biometric data.
Are Passkeys Secure?
Passkeys can provide strong protection against several password-related threats, particularly phishing and credential reuse. However, security still depends on the surrounding account and device ecosystem.
Organizations should secure account recovery, protect devices, manage authenticators, monitor suspicious activity, and provide appropriate backup methods. A secure authentication credential can still be undermined by an insecure recovery process.
Passkeys for Businesses
Businesses can use passkeys for customer authentication as well as employee identity systems where supported. For consumer applications, passkeys can reduce password-reset requests and simplify sign-in. For workforce environments, they can complement stronger identity and access-management controls.
Before deploying passkeys at scale, organizations should assess browser and device compatibility, account recovery, enrollment, support procedures, policy requirements, and integration with existing identity providers.
How to Start Using Passkeys
- Check whether your account supports passkey sign-in.
- Use a trusted device or credential manager.
- Create the passkey from the account’s security settings.
- Complete the local device authentication step.
- Test signing in with the new credential.
- Keep an appropriate recovery method available.
Expert Tips for Passkey Adoption
- Use passkeys through official account security settings rather than links from unsolicited messages.
- Keep your operating system, browser, and credential manager updated.
- Review account recovery options before removing other authentication methods.
- For organizations, test the complete enrollment and recovery journey before broad deployment.
- Maintain strong device security because the device protects the credential.
- Educate users about fake support requests and other social-engineering attacks.
Common Passkey Mistakes to Avoid
- Assuming a passkey makes every part of an account secure.
- Ignoring account recovery security.
- Using an untrusted or compromised device.
- Removing all backup access before confirming passkey recovery works.
- Failing to consider shared or managed devices in organizational deployments.
- Confusing the biometric used to unlock a device with the cryptographic passkey itself.
Preguntas frecuentes
What is a passkey in simple terms?
A passkey is a cryptographic sign-in credential that lets you authenticate without typing a traditional password.
Are passkeys safer than passwords?
Passkeys are designed to address important password weaknesses, including phishing and credential reuse. Their overall security still depends on device, account recovery, and service security.
Do passkeys use fingerprints?
A fingerprint can be used to unlock the local authenticator, but the fingerprint itself is not normally sent to the website.
Can passkeys be used on multiple devices?
Yes. Depending on the platform and credential provider, passkeys can be synchronized or otherwise made available across compatible devices.
Can a passkey be stolen like a password?
The private key is designed to remain protected by the authenticator rather than being displayed or transmitted as a password. Device compromise and account recovery attacks can still present risks.
What is WebAuthn?
WebAuthn is a web standard that allows websites to use public-key credentials for secure authentication.
Do passkeys completely eliminate passwords?
Not necessarily. Adoption depends on the service, device, account recovery design, and available authentication methods. Some systems continue to support passwords during migration.
Should businesses adopt passkeys?
Businesses can evaluate passkeys as part of a broader identity and access strategy, considering compatibility, recovery, security requirements, and user experience.
Conclusión
Passkeys replace many of the weaknesses of traditional password authentication with public-key cryptography and local device authentication. They can make sign-in easier while providing strong resistance to common phishing and credential-reuse attacks.
For users and organizations considering passwordless authentication, the most important step is to evaluate the complete security lifecycle, including enrollment, device protection, account recovery, and ongoing identity management.
Want to explore more modern cybersecurity technology? Continue with our guides on post-quantum cryptography, confidential computing, and other emerging security technologies.
