Was ist FIDO?

Instead of relying on something a user knows and can be tricked into sharing, FIDO authentication uses cryptographic credentials tied to a device or authenticator that the user controls. For enterprises moving past passwords, FIDO has become one of the foundational standards behind modern passwordless authentication, passkeys, and phishing-resistant multi-factor authentication.

The FIDO Alliance is an open industry association that develops authentication standards intended to reduce the world’s reliance on passwords. Its members include identity vendors, device manufacturers, browser developers, financial institutions, and government agencies, all working toward a common goal: making sign-ins both more secure and easier for the people doing the signing in.

FIDO is not a product, and it is not owned by any single vendor. It is a standards-based approach that can be implemented across devices, operating systems, browsers, applications, and authenticators. That openness is part of what makes FIDO useful for enterprises. The same standard that works on a security key from one manufacturer also works on a platform authenticator from another, on a mobile device, or inside a browser. The result is a consistent foundation that organizations can build on without locking themselves into a single ecosystem.

RSA is a founding member of the FIDO-Allianz and serves on its board of directors. RSA is also a member of the following FIDO Alliance working groups: 

• Enterprise deployment working group 
• User experience working group
• Metadata service working group
• Technical working group
• Enterprise user experience subgroup
• Non-CTAP software authentication subgroup

Recently, the FIDO Alliance published a Fallstudie detailing how RSA implemented passwordless authentication for its global workforce.

FIDO stands for Fast Identity Online. The name reflects the goal behind the standard: authentication that is faster, simpler, and more secure than passwords. Today, FIDO is closely associated with passwordless authentication, passkeys, and phishing-resistant MFA.

FIDO authentication is built on public-key cryptography. Every time a user registers with an online service, the authenticator generates a unique key pair. The private key never leaves the user’s authenticator. The public key is what the service stores. When the user signs in, the service issues a challenge that only the matching private key can answer, which proves the user controls the credential without ever sending a password across the network.

In practice, the flow looks like this:

1. A user registers an authenticator: This could be a device, biometric factor, security key, or other FIDO-supported authenticator.
2. The authenticator creates a key pair: The private key stays with the authenticator. The public key is registered with the online service.
3. The user verifies locally: The user may unlock the authenticator with biometrics, a PIN, or another local method.
4. The service verifies the cryptographic response: The service confirms the user controls the private key without receiving the private key itself.
5. Authentication succeeds without sending a password: This helps reduce exposure to phishing and credential theft.

Because no shared secret ever leaves the user’s authenticator, an attacker who intercepts the network traffic, breaches the server database, or sets up a convincing fake login page has nothing useful to steal.

FIDO is the broader family of open authentication standards. FIDO2 is the modern set of FIDO standards that includes WebAuthn and CTAP, and it is what most people are referring to today when they talk about passwordless logins, passkeys, and phishing-resistant MFA.

FIDO replaces the password with a cryptographic credential that the user controls. From the user’s perspective, signing in might mean a fingerprint, a face scan, a device PIN, a tap on a security key, or an approval on a mobile authenticator. From the service’s perspective, what actually authenticates the user is the cryptographic proof tied to that credential.

This is an important distinction. The biometric or PIN is not what the service sees. It is the local method the user uses to unlock their authenticator. The authentication itself depends on possession of the FIDO credential and the cryptographic response it produces. That is what makes FIDO useful for passwortlose Authentifizierung. There is nothing for the user to type, nothing for an attacker to phish, and nothing reusable to steal. Depending on how an organization deploys it, FIDO can support a fully passwordless sign-in or serve as a strong second factor inside a broader MFA flow.

Passkeys are FIDO credentials based on public-key cryptography, and they are the way most users will experience FIDO-based authentication in everyday life. A passkey can live on a single device, sync across a user’s devices through a cloud provider, or be tied to a hardware authenticator. In all cases, the underlying mechanics are the same: a private key on the user’s side, a public key registered with the service, and a cryptographic challenge instead of a password.

For enterprises, passkeys are promising but not a finished story. The user experience is strong, and the security improvement over passwords is significant. But organizations still need to think carefully about how passkeys are issued, where they live, how they sync, how they are recovered when a user loses a device, and how they are governed across the identity lifecycle. The question is not whether Passwörter work. It is whether the deployment model fits the assurance and control requirements of the environment into which they are being introduced.

FIDO credentials are bound to the legitimate service domain. That binding is what makes the standard phishing-resistant. A user tricked into visiting a lookalike site cannot complete the same authentication flow there, because the cryptographic credential will not respond to a domain it was not registered with.

A few specifics matter:

• FIDO does not send reusable passwords over the network.
• Private keys remain with the authenticator and are never exposed to the service.
• Public-key credentials are scoped to a specific relying party or domain.
• FIDO can reduce risks from credential phishing, MFA fatigue, and some MFA bypass techniques.
• FIDO is strongest when paired with strong enrollment, recovery, and device governance.

These properties are why analysts and standards bodies increasingly point to FIDO when they talk about phishing-resistant authentication. It removes the conditions that most credential-based attacks depend on.

FIDO shows up across a range of enterprise scenarios, and the right deployment usually depends on the user group and the risk profile.

• Workforce passwordless login: Employees use FIDO-supported authenticators to access business applications without passwords.
• Phishing-resistente MFA: Organizations use FIDO as a stronger authentication factor for high-risk access.
• Banking and financial services authentication: Banks can use FIDO-based passwordless login to reduce credential phishing and improve customer or workforce access security.
• Privileged user access: Administrators and high-risk users can use FIDO credentials for stronger access assurance.
• Hybrid and cloud application access: FIDO can support secure identity across cloud, hybrid, and on-premises environments when integrated with the right IAM architecture.
• Zero Trust IAM: FIDO can support Zero Trust identity and access management by strengthening user verification before access is granted.

The case for FIDO is part security, part user experience, and part long-term identity strategy. The major benefits include:

• Reduces password-based attacks: FIDO helps reduce exposure to credential theft, password reuse, and phishing.
• Supports phishing-resistant MFA: FIDO2 authentication can provide stronger protection than SMS, OTP, or basic push-based MFA.
• Improves user experience: Users can authenticate with a device, authenticator, biometric unlock, or security key instead of typing passwords.
• Supports zero trust security goals: FIDO strengthens identity verification as part of a Null Vertrauen IAM strategy.
• Helps meet stronger authentication expectations: FIDO can support organizations responding to stronger MFA requirements and cybersecurity standards.
• Scales across different user groups: Enterprises can use different authenticator types for different risk levels, roles, and environments.

Enabling FIDO is not the same as deploying it well. Most of the value comes from the surrounding decisions about authenticators, enrollment, user groups, infrastructure, and governance.

Authenticator choice

Most organizations need a mix. Mobile authenticators work well for everyday workforce access. Device-bound credentials and hardware tokens often make more sense for privileged users, regulated environments, or scenarios where credential portability needs to be tightly controlled. Platform authenticators built into laptops and phones offer a strong user experience for general workforce populations.

Enrollment and recovery

Strong authentication is only as strong as the process used to enroll it. If a user can recover a FIDO credential through a weak help desk workflow or a password-based fallback, the assurance benefits erode quickly. Recovery deserves the same design attention as the authentication flow itself.

User groups and risk levels

Different roles carry different risks. Privileged users, contractors, vendors, and employees in regulated workflows often need higher-assurance authenticators. Mapping FIDO options to user populations is part of getting deployment right.

Cloud, hybrid, and on-premises requirements

FIDO needs to work wherever identity needs to work. For many enterprises, that means cloud, hybrid, on-premises, and high-assurance environments at the same time, including sovereign or air-gapped deployments where consumer passkey ecosystems may not apply.

Governance and compliance

FIDO credentials should sit inside the identity lifecycle, not outside it. That means tying authenticator issuance, revocation, and audit evidence to access policies and compliance workflows rather than treating FIDO as a standalone capability.

FIDO is one of the strongest tools enterprises have for moving past passwords and closing the gap that credential phishing has exploited for years. But realizing that value depends on more than turning on passkeys. It depends on how authenticators are issued, how recovery is handled, how access policies are governed, and how identity assurance is maintained across cloud, hybrid, on-premises, and high-assurance environments.

RSA helps organizations bring FIDO into a complete passwordless and identity strategy, with the authenticator flexibility, governance, and deployment options enterprises need across complex environments. To see how it fits your organization, explore RSA passwortlose Authentifizierung und Multi-Faktor-Authentifizierung solutions.

What is FIDO in cybersecurity?

FIDO is a set of open authentication standards designed to reduce password reliance and support stronger sign-ins using public-key cryptography. It is widely used to enable passwordless authentication and phishing-resistant MFA.

Was ist FIDO2?

FIDO2 is the modern FIDO standard that combines WebAuthn and CTAP to support passwordless authentication and phishing-resistant MFA.

Is FIDO passwordless?

FIDO can support passwordless authentication, but it can also be used as a strong second factor. The deployment model determines whether the experience is fully passwordless.

Is FIDO the same as MFA?

FIDO is not the same thing as MFA. FIDO is a set of authentication standards, while MFA is an authentication approach that requires more than one verification factor. FIDO can be used as part of MFA, and FIDO2 can support phishing-resistant MFA or passwordless authentication depending on how it is deployed.

Is FIDO phishing-resistant?

Yes. FIDO is designed to be phishing-resistant because credentials are based on public-key cryptography and scoped to legitimate services or domains.