You've read the headlines. Passkeys eliminate phishing. They're faster than passwords. They're the future. If you're a CISO or IAM architect, you're probably already fielding questions about when your organization will "go passwordless."
Here's the problem: much of what executives and even some security teams believe about passkeys is only partially true. These myths create unrealistic expectations and can derail your authentication strategy before you've run your first pilot.
Let's separate the hype from the implementation reality.
Myth 1: Passkeys eliminate all phishing risk
Reality: Passkeys resist credential phishing, not all phishing attacks.
When someone says passkeys are "phishing-proof," they refer to a specific threat model: an attacker can't trick a user into typing a passkey into a fake login page because there's nothing to type. The FIDO2 standard binds the authentication ceremony to the origin domain, so a passkey created for app.yourcompany.com won't work on app-yourcompany-login.phishing-site.com.
That's real protection. But phishing doesn't stop at credential theft. Attackers pivot. They'll target session cookies post-authentication, use social engineering to request account recovery, or trick users into approving malicious OAuth grants. If your threat model assumes passkeys solve phishing entirely, you'll miss session hijacking attempts and consent phishing campaigns already targeting federated identity systems.
What changes: your authentication layer becomes more resilient. What doesn't: the need for session management controls, anomaly detection, and user training on authorization prompts.
Myth 2: You can deploy passkeys without touching your identity stack
Reality: Passkey adoption requires WebAuthn support across your entire authentication flow.
Passkeys aren't a configuration toggle. They require your identity provider, relying party applications, and session management infrastructure to support the WebAuthn API. If you're running legacy apps that authenticate via LDAP bind, NTLM, or custom credential handlers, those systems won't suddenly accept passkeys.
You'll need to map out every authentication boundary: workforce SSO, customer identity platforms, privileged access workflows, API authentication, and service-to-service calls. Some will support FIDO2 natively. Others will need federation layer updates. A few might require application rewrites or proxying through a modern identity broker.
The technical lift isn't trivial. You can begin preparing for passkeys now by reviewing authentication systems and running pilot programs. But "reviewing" means cataloging every authentication protocol in production, not just checking a box in your IdP admin console.
Myth 3: Users will prefer passkeys immediately
Reality: Users will prefer passkeys after they've registered them on every device they use.
The authentication experience with passkeys is genuinely better once you're set up. Biometric unlock is faster than typing a password and waiting for a Time-Based One-Time Password. But the registration and recovery experience? That's where your help desk tickets will come from.
Consider what happens when someone registers a passkey on their work laptop, then tries to log in from their phone. Without cross-device passkey sync (which requires users to opt into platform-specific credential managers), they'll need to register again. If they lose their phone or reinstall their OS, they'll need account recovery. If they're in a shared workspace without biometrics, they'll fall back to device PINs, which reintroduces memorized secrets.
Your rollout plan needs to account for device heterogeneity, BYOD policies, and the gap between "passkeys enabled" and "passkeys registered on all my devices." Expect a long tail of password fallback usage, especially for infrequent applications.
Myth 4: Passkeys reduce your attack surface
Reality: Passkeys shift your attack surface to device security and account recovery.
Passwords have a clear attack surface: credential databases, transmission channels, and user memory. Passkeys move that surface to the devices storing private keys and the recovery mechanisms you build around them.
If an attacker compromises a user's laptop and can unlock the OS (via stolen PIN, biometric spoof, or malware running in the user's session), they can use that device's passkeys. The private key never leaves the device, but the device itself becomes the target. This is why Phishing-Resistant Authentication doesn't mean device-compromise-resistant authentication.
Your recovery flows also become critical. When someone loses access to all their registered devices, how do they prove their identity? If your answer involves email-based recovery links or SMS codes, you've reintroduced the credential phishing vector you thought you'd eliminated. If your answer involves manual IT verification, you've created an operational bottleneck and a social engineering target.
Myth 5: Going passwordless means removing passwords everywhere
Reality: You'll run hybrid authentication for years, and that's the right strategy.
No organization flips a switch and becomes passwordless overnight. You'll prioritize high-risk authentication points first: privileged access systems, external-facing applications, and accounts with access to sensitive data. Internal tools with lower risk profiles might stay password-based longer.
You'll also keep passwords as a fallback for edge cases: legacy integrations, emergency access scenarios, and users who can't or won't adopt passkeys. The goal isn't password elimination, it's reducing password dependency where it matters most.
This hybrid state introduces its own complexity. You'll need clear policies about which systems require passkeys, how password fallback works, and what happens during the transition. Your Certification Campaign processes will need to account for users with mixed authentication methods. Your monitoring will need to flag anomalies like a passkey-registered user suddenly falling back to password auth.
What to do instead
Start with a threat model, not a technology mandate. Where are your credential-based attacks actually happening? Prioritize those systems for passkey pilots.
Audit your authentication protocols now. Map every system that handles user login, not just your primary IdP, but every app that maintains its own credential store or uses legacy protocols.
Design your recovery flows before your registration flows. The user who locks themselves out on day one will define your passkey experience more than any security benefit.
Run constrained pilots with technical users first. Let your IAM team and security engineers experience the device registration, cross-platform sync, and recovery edge cases before you roll this out to your entire workforce.
Set realistic timelines. You can begin preparing for passkeys now by reviewing authentication systems, prioritizing high-risk logins, running pilot programs, and planning for a gradual transition, not by announcing a passwordless deadline.
Passkeys are a meaningful improvement in authentication security. They resist a specific, high-impact threat. But they're not a silver bullet, and the myths circulating in executive briefings will set you up for failed rollouts and unmet expectations. Treat them as one component of a modern authentication strategy, not as the solution to all your identity problems.
