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Before choosing an identity provider (IdP), check whether it works with the apps and users your business depends on, whether its authentication controls match the consequences of unauthorized access, and whether your organization can operate through outages, account recovery, and a future provider change. Start by mapping risk and app requirements; then compare security evidence, administration, continuity, data handling, and contract terms. No single provider is right for every application estate.
Start with the business impact of each app
Do not begin with a vendor feature list. First identify which applications are business-critical, who uses them, what information they expose, and what happens if legitimate users are locked out or an attacker gains access. A finance system, a public-facing service, and a low-impact internal tool may need different identity controls.
NIST SP 800-63-4 treats digital identity as a risk-management problem. Its guidance distinguishes identity proofing, authentication, and federation assurance, and calls for selecting assurance levels in light of service risk and impact. The suite is written for federal requirements; non-federal organizations can use it as a framework for setting comparable requirements, not as a vendor certification or product ranking.
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- List each critical app, its business owner, user groups, and the data or actions accessible through it.
- Record the impact of unauthorized access, delayed access, and a prolonged login outage.
- Include employees, contractors, partners, administrators, and other groups with distinct access or recovery needs.
- Set requirements per service and user context rather than applying the highest assurance level to every app by default.
Will the IdP work with your actual applications?
Check each app’s supported federation protocol and its implementation details. SAML and OpenID Connect (OIDC) are both common, but they are not interchangeable. An app’s compatibility depends on what it actually supports, not simply on whether an IdP advertises a protocol.
#1 Best Overall
- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
NIST’s Choosing Security Parameters guidance says OIDC can be used with mobile and native applications and can support delegated API access; it describes SAML as less suited to mobile login and API protection. That comparison is in the SP 800-63-3 implementation resource hub, which predates the current SP 800-63-4 suite, so confirm requirements against current app and vendor documentation.
- Record whether each app uses SAML, OIDC, another method, or no federation support.
- Check client type: browser, mobile, native application, or API. Confirm supported flows and any app-specific constraints with the app vendor.
- Test older, custom, and less common apps as well as the obvious high-profile integrations. A compatibility logo list is not proof that your particular configuration works.
- Map user directories, group and role mappings, provisioning, deprovisioning, and lifecycle events. Verify that access is removed when a person changes roles or leaves.
What authentication and assurance do the apps require?
NIST uses separate assurance dimensions: IAL concerns identity proofing, AAL concerns authentication, and FAL concerns federation. These answer different questions. Do not treat a strong sign-in factor as proof that an identity was correctly established, or assume that federation security is covered by the login method alone.
Rank #2
- POWERFUL SECURITY KEY: The YubiKey 5C NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5C NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5C NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
For high-impact services, assess whether FAL2 or FAL3 is appropriate under the service’s risk context; neither level should be assigned mechanically to every business app. Specify the assurance requirements for each app and user group, then ask providers how their supported configuration meets them. NIST SP 800-63C provides the current federation guidance.
Prioritize phishing-resistant MFA for high-impact access
Require multifactor authentication (MFA), especially for administrators and sensitive accounts, and prioritize phishing-resistant methods for those users. CISA’s business guidance says, “We suggest requiring one or a combination of the following MFA verification methods,” and lists security keys first. CISA identifies security keys as providing the best protection against phishing among the methods it discusses; this is agency guidance, not a claim that any single factor eliminates identity risk. See CISA’s MFA guidance.
Rank #3
- FIDO2 & Passkey Ready: Business-ready and FIDO2 L1 certified. This key is supported by major management suites and is ideal for both individual and enterprise deployment. Works seamlessly with Gmail, Facebook, GitHub, Dropbox, Coinbase, and more.
- Dedicated Manager App: Use the Thetis Manager App for the initial hardware PIN setup. Setting the PIN on the device first ensures a smooth registration process. Once the PIN is configured, you can begin registering the key across your favorite FIDO2-compatible online services.
- Universal Connectivity (USB-C, USB-A, & NFC): Designed for PCs, Macs, iPhones, and Android. For mobile use, simply unfold the key, align it with your phone’s NFC antenna, and hold for a few seconds to authenticate.
- Enhanced MFA (FIDO2 & TOTP/HOTP): Strengthen your security with flexible options. Use the Manager App to access TOTP/HOTP features for accounts that do not yet support FIDO2.
- Check FIDO2 compatibility before purchase - Known limitations: ID Austria is not supported (requires FIDO2 Level 2). Windows Hello login only works with Windows Enterprise editions that support Entra ID. NFC is supported only through mobile authentication, Not MacOS/windows.
Compare the methods the IdP supports with your real enrollment and recovery process. If considering a physical FIDO/WebAuthn security key, check compatibility with the IdP, browsers, devices, and recovery arrangements before selecting a model.
Test exceptions, not just a successful sign-in
During a pilot, verify MFA enrollment, a lost or replaced device, fallback methods, account recovery, privileged sign-in, and emergency access. A policy that is strong in normal use can be undermined if recovery is weak or if staff cannot restore legitimate administrative access when the usual path fails.
Rank #4
- POWERFUL SECURITY KEY: The Security Key NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
How secure is the identity provider itself?
An IdP is a control point for access to many applications, so assess the provider’s service and administration—not only the authentication options it sells. NIST SP 800-63C calls for appropriately tailored security controls at least at the moderate SP 800-53 baseline or an equivalent standard selected for the systems being protected. CISA’s December 2023 Identity and Access Management: Recommended Best Practices for Administrators includes questions about how a provider secures both the protocol and the service.
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Ask for current, relevant evidence and verify its scope, date, and applicability to the service and region you would use. A certification or audit badge alone does not establish that a particular product, deployment, or control is covered.
Best Value
- FIDO2 & Passkey Ready: Business-ready and FIDO2 L1 certified. This key is supported by major management suites and is ideal for both individual and enterprise deployment. Works seamlessly with Gmail, Facebook, GitHub, Dropbox, Coinbase, and more.
- Dedicated Manager App: Use the Thetis Manager App for the initial hardware PIN setup. Setting the PIN on the device first ensures a smooth registration process. Once the PIN is configured, you can begin registering the key across your favorite FIDO2-compatible online services.
- USB TYPE A Connectivity & DONGLE Design: Designed for PCs, Macs, laptops and Android devices that utilize a USB-A port. Plug and stay, or carry it on a keychain. (Item Size: 0.75 X 0.74 IN x 0.25 IN)
- Enhanced MFA (FIDO2 & TOTP/HOTP): Strengthen your security with flexible options. Use the Manager App to access TOTP/HOTP features for accounts that do not yet support FIDO2.
- Check FIDO2 compatibility before purchase - Known limitations: ID Austria is not supported (requires FIDO2 Level 2). Windows Hello login only works with Windows Enterprise editions that support Entra ID. NFC functionality is not supported.
- Independent assessments and the boundaries of the systems they cover.
- Privileged administration, separation of duties, and protection of keys and other sensitive credentials.
- Logging, log retention, and the ability to export relevant events to your monitoring systems.
- Vulnerability handling, incident communication terms, and responsibilities shared with subcontractors.
- How the provider protects the federation protocol and the service that issues or validates identity assertions.
Can you keep operating during an outage or compromise?
Evaluate continuity before signing, not after the IdP becomes a dependency for every critical app. Compare provider-specific service commitments and exclusions, support escalation routes, incident communications, recovery procedures, and planned-change practices in current product documentation and contract terms. The cited standards and guidance do not establish the SLA or recovery performance of any particular provider.
Ask how administrators can regain control if their normal authentication path is unavailable or compromised, and define emergency access that is protected, limited, monitored, and periodically exercised. Pilot an IdP outage scenario and document which apps become inaccessible, which approved emergency procedures apply, and who is authorized to invoke them.
Where will identity data go, and what happens when you leave?
Check the actual deployment and contract against your jurisdictions and obligations. NIST identifies both the type of data accessed and the IdP’s location—including whether it is inside or outside the enterprise boundary—as risk considerations. A provider’s general statement about regional availability is not a substitute for confirming where the relevant identity data is processed and stored under your configuration.
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- Review the contract for incident notice, data handling, support responsibilities, and changes to service or terms.
- Establish what identity and audit data can be exported, in what format, and under what time or access constraints.
- Check termination assistance, migration provisions, and how you would move app integrations, policies, groups, and user records to another provider.
How should you compare shortlisted providers?
Use the same evidence requests and representative scenarios for every candidate. Weight the criteria according to the impact and risk of your own apps; there is no evidence-based universal weighting.
| Comparison area | What to verify |
|---|---|
| App and protocol coverage | Required protocols, client types, older apps, API needs, and tested configurations. |
| Assurance and MFA | How requirements map to IAL, AAL, and FAL; phishing-resistant options; enrollment and recovery behavior. |
| Administration and lifecycle | Directory connections, role and group mapping, provisioning, deprovisioning, and privileged access workflows. |
| Security evidence and incident controls | Assessment scope and date, service and protocol protections, logging, incident communication, and subcontractor responsibilities. |
| Availability, recovery, and support | Contractual commitments and exclusions, escalation paths, administrative recovery, and outage procedures. |
| Data and regulatory fit | Deployment-specific data locations, retention and deletion, jurisdictional obligations, and contract terms. |
| Portability and total contract cost | Export, migration, termination assistance, and the full contract costs relevant to your planned deployment. |
Run a pilot that includes failures and rollback
Choose representative apps and user groups, then test both ordinary operation and the failure cases that matter to the business. Record what passed, what required configuration changes, and what remains a contractual or operational dependency.
Quick Recap
- Test normal login for each representative app and client type.
- Enroll users in MFA and verify privileged access and recovery after device loss.
- Test role changes and deprovisioning, including whether access is removed from connected apps as expected.
- Exercise the documented emergency-access and IdP-outage procedures.
- Validate logging and export, then test migration or rollback assumptions before broad deployment.
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