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For administrator accounts and access to sensitive systems, make phishing-resistant MFA the target. FIDO2/WebAuthn security keys or platform authenticators are a strong choice where your identity provider and applications support them; PKI-based authentication can also be phishing-resistant when properly deployed. Authenticator-app codes and push approvals are safer than passwords alone, but they are not phishing-resistant. If a service cannot yet support a stronger method, use number-matched push or an authenticator-app code as an interim measure—not as a phishing-proof replacement.
What makes MFA phishing-resistant?
Phishing resistance is a property of the authentication protocol, not a label for any method that adds a second step. NIST defines it in terms of preventing authentication secrets or valid outputs from being disclosed to an impostor verifier without depending on the user to spot the deception. With verifier-name binding, the authenticator’s response is tied to the legitimate service or domain. A fake sign-in page therefore cannot simply collect and relay the same response to the real service.
NIST SP 800-63B-4, §3.2.5, describes WebAuthn/FIDO2 this way: “WebAuthn [WebAuthn], which is used by authenticators that implement the Fast Identity Online 2 (FIDO2) specifications [FIDO2], is an example of a standard that provides phishing resistance through verifier name binding by choosing an authenticator secret based on the authenticated domain name of the verifier.” Read NIST SP 800-63B-4.
By contrast, a one-time code entered by hand is not bound to the sign-in session. A phishing site can capture the code and relay it to the real service before it expires. Push prompts can also be manipulated: repeated unwanted prompts may pressure a user to approve one. Adding a number-matching step helps against that kind of push bombing, but does not bind the approval to the legitimate website.
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How the main MFA options compare
| Method | How it works | Phishing-resistant? | Business role |
|---|---|---|---|
| FIDO2/WebAuthn security key or platform authenticator | Uses cryptographic authentication associated with the legitimate verifier or domain. A roaming hardware key works across supported devices; a platform authenticator is tied to a device. | Yes, when correctly implemented; NIST identifies WebAuthn/FIDO2 as verifier-name binding. | Preferred target for privileged accounts and sensitive access where the identity provider and applications support it. |
| PKI-based authentication, such as certificate-based methods | Uses public-key cryptography. | Yes, when correctly deployed; the exact assurance depends on implementation. | Relevant where the organization already manages certificates, smart cards, or device identity. |
| Authenticator-app OTP | The user enters a generated one-time code at sign-in. | No. A phisher can relay the entered code. | Better than password-only access; an interim option when stronger methods are unavailable. |
| App push with number matching | The user matches or enters a number shown in the sign-in flow to approve a push. | No. It helps counter push bombing but remains vulnerable to phishing. | Interim app option when phishing-resistant MFA cannot yet be deployed. |
| App push without number matching | The user approves a prompt without an additional matching step. | No. CISA identifies push bombing and user-error concerns. | Do not prefer it when stronger methods are available. |
| SMS or voice code | A code is sent to a phone or email endpoint. | No. CISA notes phishing, SS7, and SIM-swap risks. | Last resort when stronger options are unavailable. |
CISA’s small-business comparison places security keys above number matching and OTP, and distinguishes phishing-resistant methods from app-based methods. CISA’s SMB MFA guidance and its phishing-resistant MFA fact sheet provide further context.
Which method should your business require?
Administrators and sensitive access: choose phishing resistance
Prioritize administrator accounts, remote access, and accounts that handle sensitive information. CISA advises businesses to begin MFA rollout with administrators and employees handling sensitive information, then cover services such as email, file storage, and remote access. Offer FIDO2/WebAuthn or appropriately deployed PKI for these accounts wherever the full sign-in path supports it. CISA’s plain-language guidance is: “Businesses should aim to use a phishing-resistant MFA method.” CISA: Require Multifactor Authentication.
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Where phishing-resistant sign-in is not available: use an interim app method
If an application cannot yet use FIDO2/WebAuthn or PKI, choose number-matched push or OTP over password-only access. Be clear in policy and user training that neither is phishing-resistant. Number matching is a meaningful improvement over push approval without a matching step because it helps reduce push-bombing risk; it does not stop an attacker from relaying a phished sign-in.
Do not assume every passkey has the same assurance
NIST discusses syncable authenticators, including passkeys, as options for applications targeting up to AAL2 and says their tradeoffs should be balanced. AAL3 requires a cryptographic authenticator with a non-exportable private key and phishing resistance. The assurance level depends on implementation and sync behavior; the word “passkey” alone does not establish equivalence to a hardware security key or satisfy every assurance requirement. NIST SP 800-63B-4 and NIST’s guidance on syncable authenticators explain the distinction.
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Plan a rollout that works across your services
- Inventory the sign-in systems. List your identity provider and the services used for email, collaboration and file storage, remote access or VPN, and administration. Check whether each supports FIDO2/WebAuthn or PKI before buying keys; support must extend across the identity provider and the application’s integration.
- Set priorities. Start with administrators, remote access, and accounts handling sensitive data. Then expand MFA coverage to email, file storage, and other business-critical services.
- Choose the target and bridge methods. Set phishing-resistant authentication as the target for privileged and sensitive access. Where a service cannot support it yet, use number-matched app push or OTP as a bridge, documenting that these methods remain phishable.
- Plan enrollment, replacement, and recovery before enforcement. A lost phone or key can lock a user out. Where the system allows, register a second authenticator or combine a device-tied platform authenticator with a roaming authenticator. CISA’s federal hybrid-identity architecture discusses these platform-versus-roaming distinctions and recovery considerations; its federal context should not be mistaken for a private-sector mandate. CISA SCuBA hybrid-identity guidance.
- Pilot the policy and support process. Test new-device setup, a lost authenticator, employee departure, and fallback with a small group. Confirm the help desk can restore access without weakening the protection for everyone else.
- Check hardware fit before purchasing. For physical security keys, verify supported connectors, USB or NFC needs, operating-system and identity-provider compatibility, and whether users can register a second key. CISA names YubiKey as an example of a security key, not as a one-size-fits-all requirement. CISA’s SMB MFA guidance.
What the standards mean for a private business
NIST SP 800-63B-4 says verifiers at AAL2 must offer at least one phishing-resistant option. It also says federal agencies must require staff, contractors, and partners to use phishing-resistant authentication for federal information systems. These are statements about the standard’s assurance framework and federal systems, not a blanket legal requirement for every private business. A business should use its regulatory, contractual, and risk requirements to determine which obligations apply to its own systems.
CISA’s SCuBA hybrid-identity architecture was written for federal agencies. Its explanations of platform and roaming authenticators, application integration, and recovery can inform business planning, but federal requirements in that architecture should not be generalized as private-sector mandates.
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