Passwordless Authentication

Passwordless authentication is any method of verifying a user's identity without requiring a traditional password. Instead, it relies on possession factors (a registered device or security key), inherence factors (biometrics), or one-time links and codes. By removing the password, it eliminates the most common attack surface (phishing, credential stuffing, and password reuse) while often improving the login experience.

How passwordless authentication works

• The user registers a trusted authenticator, such as a device, biometric, or hardware key.
• At login, the system challenges that authenticator instead of asking for a password.
• The user responds with a fingerprint, face scan, device approval, or security key tap.
• Cryptographic verification (often based on the FIDO2 / WebAuthn standards) confirms identity.
• No shared secret is transmitted or stored as a reusable password.

Common passwordless methods

• Passkeys based on FIDO2 / WebAuthn (the leading standard)
• Biometrics such as fingerprint or facial recognition
• Hardware security keys (for example, FIDO2 keys)
• Magic links sent to a verified email
• One-time codes via an authenticator app

Examples and use cases

A SaaS company moves staff to passkeys, so engineers unlock apps with a fingerprint instead of a password and a separate MFA prompt. Phishing attempts collapse, because there is no password to steal. For IT, the rollout question is coverage: which apps support passwordless, which still force passwords, and how to govern the mixed estate during transition.

Related concepts

• Passkey and Multi-Factor Authentication (MFA)
• Zero Trust
• Live article: Trends in identity and access management for 2025 and beyond
• Live solution: Corma for security teams

FAQ

Is passwordless authentication more secure than passwords plus MFA?

‍Generally yes. Removing the password removes phishing and reuse risk, and modern passwordless methods are resistant to credential theft by design.

What standard powers most passwordless logins?

‍FIDO2 and WebAuthn, which underpin passkeys and hardware security keys.

Can a company go fully passwordless?

‍Often partially in practice, because not every legacy app supports it yet. A phased rollout with clear coverage tracking is the realistic path.

Corma helps IT and security teams track authentication coverage and access across the full app estate. See Corma for security teams or request a demo.