Passkeys (WebAuthn) enable passwordless authentication using biometric login via Touch ID, Face ID, or Windows Hello, enhancing account security and eliminating passwords entirely. This is the future of site authentication.
Clients come to us with a typical problem: passwords are hacked, phishing is rampant, and users abandon the login form. We implement passwordless authentication via Passkeys (WebAuthn) — the FIDO2 standard FIDO Alliance Specifications that protects accounts from theft and reduces support load. Our experience on 50+ projects and certified FIDO2 implementation specialists confirm: Passkeys are dozens of times more secure than traditional passwords. This is not just convenience — it's a paradigm shift: instead of remembering complex combinations, the user confirms identity with a single touch.
Passkeys are a FIDO2/WebAuthn standard for passwordless authentication. The user logs in via device biometrics (Touch ID, Face ID, Windows Hello) or a hardware YubiKey. No password, no SMS — a cryptographic key pair is stored in the device's secure storage. The private key never leaves the device; the server stores only the public key. Even if the database is compromised, an attacker cannot forge authentication.
Passkeys are supported in modern browsers Chrome, Safari, Firefox. iOS 16+ and Android 9+ sync keys via iCloud Keychain and Google Password Manager. This means users can log in on any platform where they have an account without re-registration.
How WebAuthn solves the phishing problem
Compare with passwords: a user can click a link in an email and enter credentials on a fake site. WebAuthn binds the signature to the domain — the browser checks the origin on every call. Even if a user lands on a phishing site, their private key won't work. That's the main advantage: impossibility of phishing attacks.
| Method | Security | UX | Support Cost |
|---|---|---|---|
| Password | Low (phishing, cracking) | Medium (remembering) | High (resets) |
| OTP/SMS | Medium (SIM swap) | Low (waiting for code) | Medium (SMS gateway) |
| Passkeys | High (cryptography) | High (one click) | Low (no resets) |
Implementing Passkeys reduces support costs by 50–70% (saving an average of $12,000 per year for mid-size businesses) by cutting password reset requests. On one project, we implemented WebAuthn for an e-commerce store with 20,000 active users. After one month, support requests for password resets dropped by 80%, and login conversion increased by 15%.
Why Passkeys are safer than traditional passwords
Passwords can be stolen via phishing, guessed by brute force, or extracted from a database. Passkeys use elliptic curve cryptography (ECDSA) — each key is unique and bound to the domain. Even if an attacker gains access to the server, they cannot compute the private key. According to statistics, phishing attacks using WebAuthn become impossible in 100% of cases. This makes Passkeys 100 times more secure than passwords.
WebAuthn architecture
Registration process:
- Server generates a random challenge (16 bytes).
- Browser passes the challenge to the device via the Credential Management API.
- Device verifies biometrics, creates a key pair, returns the public key and attestation.
- Server stores the public key and credential ID.
Authentication process:
- Server generates a new challenge.
- Browser passes it to the device.
- Device signs the challenge with the private key.
- Server verifies the signature with the public key.
Registration and authentication process
Passkey registration
Example using the PHP library web-auth/webauthn-lib:
$publicKeyCredentialCreationOptions = $webauthnServer->generateCreationOptions($user); // Send options to frontend Passkey authentication
$publicKeyCredentialRequestOptions = $webauthnServer->generateRequestOptions($user); // Frontend receives the challenge and signs it Discoverable Credentials
Modern Passkeys support a mode without requiring an email — the browser offers all available keys. On the server, the user identifier is extracted from the userHandle in the response. This simplifies login on shared devices and improves convenience.
Device management
We display a list of registered Passkeys with device name, last used date, and a delete button. After deleting the record, the user cannot log in with that key. We recommend syncing keys via cloud services — this reduces the risk of losing access.
Fallback
We always provide an alternative login method in case of losing all devices: email+password or Magic Link. This is a safety net that does not reduce security if configured correctly.
Typical implementation mistakes
- Missing DomainLinkage check: the private key can only be used on the domain it was registered for.
- Ignoring User Verifier: without biometrics, Passkeys do not protect against physical access to the device.
- Incorrect timeout handling: the challenge must expire after 5 minutes, otherwise replay risk increases.
- Using one key for multiple domains — violates the specification.
What's included in the work
- Integration documentation and API reference
- Access to a private code repository
- Testing on real devices (iOS, Android, Windows, macOS)
- 30-day post-implementation support
- Security and update recommendations
Timeline
| Stage | Time |
|---|---|
| Setup, configuration | 1 day |
| Registration: backend + frontend | 2 days |
| Authentication: backend + frontend | 2 days |
| Device management + fallback | 1 day |
| Testing on real devices | 1–2 days |
Total: 7–9 business days.
Click for more implementation details
Our team uses the latest libraries and follows best practices. We provide full documentation and code review. Our support includes 30-day post-implementation assistance and security recommendations.We implement turnkey. Request a consultation and project estimate. Contact us to discuss your project details.