Do You Really Need Passkeys? The Honest Truth About Authentication Methods

You've probably heard the buzz about passkeys and wondered, "Can I finally ditch passwords?" The answer is a resounding yes—but only if you're ready to move beyond the same old multi-factor authentication (MFA) that's been failing us. As an editor who's watched too many security teams cling to outdated methods, I'm here to bust some myths and give you a clear recommendation: start deploying passkeys now, and treat everything else as a stopgap. Let's dive into the questions you're actually asking.

What's the difference between authentication and authorization?

It's shocking how often these get conflated. Authentication is the process of verifying who you are—the classic "something you know, something you have, something you are" (Tenable). Authorization, on the other hand, happens after that and determines what you're allowed to do (Tenable). Think of it this way: authentication is showing your ID at the door; authorization is whether you get a backstage pass. In the world of access control, you need both, but they're distinct steps. I've seen organizations spend millions on fancy authentication while their authorization is a mess—that's a recipe for disaster.

Isn't MFA already good enough? Why do I need passkeys?

Here's the uncomfortable truth: not all MFA is created equal. CISA explicitly states that some forms are vulnerable to phishing, "push bombing" or MFA fatigue, SS7 attacks, and SIM swaps (CISA). If you're relying on SMS codes or even one-time passwords from an authenticator app, you're still susceptible to a determined phisher. Passkeys, on the other hand, are phishing-resistant because they're bound to a specific domain. A passkey created for your bank won't work on a look-alike phishing site, because the private key never leaves your device and the signature only validates against the original domain (Microsoft). That's why CISA calls phishing-resistant MFA the "gold standard" (CISA).

Are passkeys really more secure than passwords plus MFA?

Yes, and it's not even close. Passkeys are built on FIDO standards and use origin-bound public-key cryptography. When you sign in, your device digitally signs a challenge with a private key that never leaves the device, and the website verifies that signature with a public key (Microsoft). No password is ever sent over the internet, so there's nothing to intercept or steal. Plus, each passkey is unique to the site it was created for, so it won't be presented to a look-alike phishing site (Microsoft). That's a level of security that password-based MFA simply can't match. I'm not saying passwords are dead everywhere, but for protecting sensitive accounts, passkeys are the way to go.

What about the other authentication methods—are they obsolete?

Not obsolete, but they've got their place. SAML 2.0 and OIDC are still essential for single sign-on across enterprise apps. OIDC, built on OAuth 2.0, is the modern standard for federated authentication (OpenID Connect). SAML is still widely used in legacy enterprise setups (OASIS). But these are protocols for *how* you authenticate, not what you use as the factor. You can have OIDC with a password or OIDC with a passkey—the latter is far better. Similarly, Kerberos is still humming along in Windows environments, but it's not something you'd expose to the internet. The key is to build a modern identity layer that supports strong, phishing-resistant factors.

I'm a small business—do I really need to worry about phishing-resistant MFA?

Yes, and I'm not just saying that because the federal government mandates it. OMB M-22-09 directed federal agencies to achieve phishing-resistant MFA by the end of fiscal year 2024 (OMB). If the government demands it, you can bet attackers are already targeting everyone else. Small businesses are often the soft underbelly—they have valuable data but fewer resources to recover from a breach. The good news? Passkeys are actually easier to manage than passwords. They eliminate the help desk calls for resets and reduce password fatigue (CISA). You can start with consumer services like Google, Apple, and Microsoft, which all support passkeys now. Then, for your own apps, look for identity providers that support WebAuthn. It's not a huge lift, and the payoff is enormous.

How do I start using passkeys today? Are they ready for prime time?

Absolutely ready. Passkeys are supported on major platforms—Windows, macOS, Android, iOS—and by browsers like Chrome and Edge (Microsoft). There are two types: device-bound passkeys, which are stored only on your device, and synced passkeys, which are saved in a cloud credential manager and can be used across devices (Microsoft). For a personal example, I set up a passkey on my phone for my Microsoft account. Now, when I sign in on a new laptop, I just confirm a notification on my phone and use my fingerprint. No password, no SMS code, no authenticator app. It's faster and more secure. For enterprises, you can deploy FIDO2 security keys for high-value accounts, which are roaming authenticators that plug in via USB or NFC (CISA). And remember, passkeys are considered MFA because you need the device (something you have) and a biometric or PIN (something you are or know) (Microsoft). So you're not sacrificing security—you're upgrading it.

My recommendation? Start with your most critical accounts—email, financial, and cloud services. Enroll in passkeys where available, and for anything else, enable phishing-resistant MFA like hardware tokens or PKI-based smart cards (CISA). Don't wait for a perfect solution; the perfect is the enemy of the good. Passkeys are here, they're proven, and they're the single biggest step you can take to protect yourself from phishing.

The single most important thing to remember

Passkeys are the gold standard of authentication because they're phishing-resistant, and you should adopt them wherever you can—your passwords and legacy MFA are simply not enough anymore.

Sources

• Microsoft Passkeys - https://support.microsoft.com/en-us/windows/security/identity-signin/what-are-passkeys-and-why-they-matter
• CISA Phishing-Resistant MFA - https://www.cisa.gov/sites/default/files/2023-01/fact-sheet-implementing-phishing-resistant-mfa-508c.pdf
• Microsoft FIDO2 Passkeys (Entra ID) - https://learn.microsoft.com/en-us/entra/identity/authentication/concept-authentication-passkeys-fido2
• OMB M-22-09 - https://www.whitehouse.gov/wp-content/uploads/2022/01/M-22-09.pdf
• Tenable - https://www.tenable.com/cybersecurity-guide/learn/key-iam-components