Infosec glossary

Passwordless Authentication

Passwordless authentication is a broad term, which is why it often gets used loosely. The useful version describes authentication methods that do not require the user to enter a password as the primary secret during sign-in.

Operating principle 5 min read By Infosec Writing Studio editorial team Published Apr 18, 2026

What is Passwordless Authentication?

Passwordless authentication is an approach to sign-in that does not rely on the user typing a traditional password. Instead, it uses other factors or credential models, such as passkeys, device-bound credentials, biometrics, or hardware-backed authentication, to verify identity.

Key takeaways

Passwordless authentication is broader than passkeys alone.
The term describes a sign-in model, not one specific protocol.
The security value depends on which passwordless method is being used.
If the explanation does not distinguish between convenience and security strength, it is incomplete.

Common mix-ups

Using passwordless authentication as if it automatically means phishing-resistant authentication.
Collapsing all passwordless methods into one level of security assurance.
Treating the term as a branding label rather than an authentication design choice.

Why the term became common

Passwords create predictable problems: reuse, phishing, reset overhead, and weak user behavior. Passwordless authentication became a common term because teams wanted models that reduced those weaknesses without making sign-in harder to use.

That does not mean every passwordless method is equally strong. The umbrella is useful, but the underlying mechanism still matters.

What sits inside passwordless authentication

Passwordless authentication can include several approaches, from passkeys to certificate-backed or device-based methods. What they share is that the user is not authenticating by transmitting a reusable password to the service.

This is why good definitions of passwordless authentication point to the underlying mechanism instead of stopping at the phrase itself.

Passkeys
Device-bound credentials
Hardware-backed authentication
Biometric or PIN-based local unlock of stronger credentials

How to keep the term precise

The cleanest way to explain passwordless authentication is to say what replaces the password and how that changes risk. Without that second step, the term can sound more modern than meaningful.

It is especially important to separate the umbrella from stronger subcategories like passkeys or phishing-resistant MFA, because the reader may otherwise assume more security assurance than the system actually provides.

The term is clearer when the nearby language is clear too.

Use the pages below when you need adjacent terms, category context, or a longer explanation instead of leaving the definition to stand on its own.

Adjacent terms

Passkeys Phishing-Resistant MFA Identity Security

Sources used to check the definition and terminology

Microsoft Security reference for Passwordless Authentication

Open the external source used to verify the term's scope and related language.

Guides

Where the definition expands into a longer explanation

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