Table of Contents
- What Is Access Management?
- What Is Access Control?
- What Is CIAM (Customer Identity and Access Management)?
- What Is Single Sign-On (SSO)? Benefits, Risks, And Best Practices
-
Authentication and Authorization Explained
- Authentication and Authorization Explained
- Differentiating Authentication from Authorization
- Authorization Models: RBAC, ABAC, and Policy Enforcement
- Lateral Movement and Attacker Workflow
- Cloud Security Implications for Authorization
- Zero Trust Alignment with Access Control
- Authentication and Authorization FAQs
- What is BeyondCorp?
- What is the Evolution of Multifactor Authentication
- What Is the Principle of Least Privilege?
- What Is Cloud Infrastructure Entitlement Management (CIEM)?
- What is Multifactor Authentication (MFA) Implementation?
- What Is Identity and Access Management (IAM)?
What Is Passwordless Authentication?
3 min. read
Table of Contents
Passwordless authentication is a method that allows a user to access an application or IT system without entering a password or answering security questions. Instead, the user proves identity with a stronger signal such as a biometric, a trusted device, or a hardware security key (often using phishing-resistant standards like FIDO2/WebAuthn).
Passwordless authentication is often used alongside multifactor authentication (MFA) and single sign-on (SSO) to strengthen security, improve user experience, and reduce password reset overhead.
Key Points
-
Reduced credential risk: Eliminates password reuse and weak-password habits that enable credential stuffing, brute force, and account takeover. -
Better user experience: Removes password fatigue (no memorizing, rotating, or resetting passwords). -
Stronger Zero Trust posture: Fits Zero Trust by strengthening identity verification and enforcing least privilege access decisions. -
Works best with SSO + MFA: Centralizes access while enabling risk-based, context-aware authentication policies.
Passwordless Authentication Explained
Unit 42 incident response data shows why reducing credential dependence matters: previously compromised credentials were the initial access vector in 20.5% of investigated cases, and that trend has risen sharply. Separately, Unit 42 also reports that 86% of the cyberattacks they responded to in 2024 had a direct business impact.
Passwordless authentication strengthens security by reducing risky password management practices and shrinking the number of credential-based attack paths. It also improves usability because there’s no password to remember, rotate, reset, or reuse.
The Problem With Passwords
The modern workforce uses many applications, which creates password sprawl. When people are overloaded with passwords, they take shortcuts—reusing credentials, choosing weak passwords, storing passwords insecurely, or falling for social engineering.
Attackers exploit these predictable behaviors because simple username-and-password authentication is easy to steal, guess, and replay.
Passwordless Authentication Methods: Options, Strengths, and Tradeoffs
Method |
What It Uses |
Examples |
Strengths |
|
|---|---|---|---|---|
Hardware Security Keys (FIDO2/WebAuthn) |
Cryptographic keys |
USB/NFC keys, platform authenticators |
Phishing-resistant, origin-bound |
Enrollment + recovery planning is critical |
Biometrics (Device-Bound) |
Fingerprint/face + secure enclave |
Windows Hello, mobile biometrics |
Fast UX, strong local verification |
Still needs strong device security + policy |
Passkeys |
Public-key credentials synced via OS/credential manager |
Platform passkeys |
Eliminates passwords in many flows |
Cross-platform recovery/portability must be managed |
Certificates / Smart Cards |
Digital certificates |
PIV/CAC, enterprise cert auth |
Strong for regulated environments |
Lifecycle management + PKI complexity |
Mobile App Approval |
Possession + approval |
Push approve/number matching |
Easier rollout than keys |
Watch for push fatigue / social engineering |
Magic Links / OTP Links |
One-time link |
Email/SMS “sign-in link” |
Low friction |
Depends on email/SMS security; not always phishing-resistant |
Table 1: A side-by-side comparison of common passwordless sign-in methods—what each uses, where it’s typically deployed, the security/UX advantages, and the practical risks to plan for during rollout.
Common password-based attack techniques include:
- Brute force: Automated guessing of passwords or weak password patterns.
- Credential Stuffing: Automated testing of stolen username/password pairs across many services, relying on password reuse.
- Phishing: Trick users into providing credentials through fraudulent messages or fake login pages.
- Keylogging: Malware captures keystrokes to steal usernames and passwords.
- Man-in-the-middle: Intercepting traffic on untrusted networks and replaying credentials or sessions.
How Passwordless Authentication Works
Passwordless authentication replaces “something you know” (a password) with stronger evidence, such as:
- Hardware security keys: FIDO2/WebAuthn keys using USB, NFC, or Bluetooth.
- Biometrics: Fingerprint, facial recognition, voice, or retina scanning.
- Mobile authenticator apps: Push approvals or number-matching on a trusted phone.
- Certificates and badges: Smart cards, proximity badges, or device certificates.
Why this matters: passwordless approaches reduce the usefulness of stolen passwords and can be significantly more resistant to phishing—especially when using phishing-resistant methods like FIDO2 or smart cards.
How Passwordless Fits With SSO and MFA
Passwordless is usually not deployed “solo.” It’s most effective as part of a broader identity strategy:
Passwordless + SSO
SSO lets users authenticate once and access multiple approved applications. When SSO is paired with passwordless sign-in (e.g., a security key or biometric), repeated login prompts and opportunities for password-based compromise are reduced.
Passwordless + MFA (including adaptive MFA)
Many MFA programs support adaptive authentication, in which the system adjusts what it asks for based on context (location, time, IP address, device, and other signals). A low-risk login might require fewer steps, while a high-risk login could require additional verification.
Passwordless Authentication Benefits
Passwordless authentication helps organizations:
- Improve user experience: Fewer lockouts and password resets, faster sign-ins, and less friction across applications.
- Strengthen security: Fewer password-based attacks and less exposure to phishing and credential theft.
- Simplify IT operations: Reduced password lifecycle management (issuing, rotating, resetting, and troubleshooting).
FAQs
No. Passwordless means no password is used in the login flow. MFA means multiple factors are required. Passwordless methods can be a strong factor in MFA, but they’re not identical.
It can dramatically reduce classic password attacks (reuse, stuffing, spraying), but attackers may pivot to session theft, social engineering, device compromise, or weak recovery flows.
They use cryptographic key pairs that are bound to the service’s domain. A fake login page can’t replay the credentials to a different origin the way it can with passwords or OTP codes.
Usually, yes. Passwordless changes how users authenticate; SSO extends that authentication to more apps. They solve different problems and are often implemented together.
Account recovery and enrollment governance. If recovery is weaker than authentication, attackers will target recovery workflows—because that’s the softest door in the building. (And they always check the side doors.)
