They should map the authentication design to PSD3, PSR1, and DORA as one governance problem rather than three separate reviews. That means documenting phishing resistance, dynamic linking where required, alternative authenticator support, and operational continuity evidence before supervisory questions become audit findings.
How regulatory scrutiny changes the authentication question for banks
For banks, the issue is not whether phishing-resistant authentication is desirable, but how to show it satisfies the regulatory expectation behind the control. Supervisors usually care about the full operating model: whether the method resists phishing, how it behaves under recovery and exception paths, and whether it remains supportable at scale across user populations and channels.
That is why the authentication design has to be treated as part of a governed control set, not a product feature. If the bank cannot explain the control in operational terms, it will struggle to defend it when reviews move from policy language to evidence.
In practice, that means the bank should be able to describe which authenticator methods are allowed, where phishing resistance is mandatory, and how fallback methods are constrained. It should also be clear how the design aligns with the applicable requirements for strong customer authentication, transaction integrity, and resilience, rather than assuming one mechanism automatically satisfies every rule.
What evidence matters before a supervisory review
Evidence has to show more than intent. Banks need documentation that ties the chosen methods to the actual authentication journey, including enrollment, step-up, recovery, and exception handling. The most useful artefacts are control narratives, technical design records, policy exceptions, and testing results that show the control still works when users switch devices, lose tokens, or enter recovery flows.
That evidence should also show operational continuity. A method can be phishing-resistant and still fail governance scrutiny if the bank cannot support outages, customer support recovery, or inaccessible devices without silently weakening assurance. The reviewer is usually looking for whether the bank can keep the control intact under stress, not just whether the nominal design is strong.
For banks that are modernising from weaker MFA, this is where Passwordless and Passkeys Guide is useful because it ties phishing-resistant sign-in to rollout, recovery, and assurance-level decisions. For a broader operating model, Workforce Identity Security Guide helps connect phishing-resistant MFA, lifecycle controls, and account recovery into one governance view.
Why dynamic linking, alternatives, and continuity all belong in the same review
Many banks get into trouble by treating dynamic linking, alternative authenticators, and continuity planning as separate workstreams. They are really part of one assurance story. If transaction signing is required, the bank has to show that the method binds the payment details the way the relevant rule expects. If alternatives are offered, they must not become a weaker back door that undermines the stronger primary method.
That same logic applies to continuity. A bank may need multiple authenticator options for different user groups, accessibility needs, or device constraints. The governance question is whether those alternatives preserve the same security outcome or whether they create a lower-assurance class that needs tighter limits, narrower use, or explicit approval.
Supervisory scrutiny becomes especially sharp when exceptions are recurring rather than exceptional. If business teams rely on fallback paths for convenience, the bank has effectively created a second authentication standard that may be harder to defend than the primary one.
Risk and Threat Considerations
Phishing-resistant authentication reduces one of the most common paths to account takeover, but it does not eliminate governance risk. The main exposure is control drift: a bank may standardise on strong methods in principle while allowing weaker recovery, support, or exception paths in practice. That creates a false sense of assurance until a review, incident, or fraud event exposes the gap.
Failure mechanism: Weak fallback methods, overbroad exceptions, or poorly governed recovery processes let attackers or insiders bypass the intended phishing-resistant path and regain access through a lower-assurance route.
Impact: The bank can face account takeover, payment fraud, failed audit expectations, and remediation programmes that are more expensive than designing the control correctly up front.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-63, NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the technical controls, while DORA and ISO/IEC 27001:2022 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | Digital Identity Guidelines | Phishing-resistant authentication and authenticator assurance are central to the question. |
| Recommendation — Align authenticator strength, phishing resistance, and recovery to the required assurance level. | ||
| DORA | Digital Operational Resilience Act | The question includes continuity evidence and operational resilience under scrutiny. |
| Recommendation — Demonstrate that authentication controls remain available, recoverable, and supportable under stress. | ||
| NIST SP 800-53 Rev 5 | IA-2 — Identification and Authentication (Organizational Users) | Banks need governed user authentication controls with clear assurance and exceptions. |
| IA-5 — Authenticator Management | The answer depends on managing authenticators, recovery, and lifecycle evidence. | |
| Recommendation — Enforce strong user authentication and document any constrained fallback methods. Control authenticator issuance, replacement, recovery, and revocation as governed processes. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | Regulatory scrutiny often tests whether access control is defined and consistently enforced. |
| A.8.5 — Secure authentication | Phishing-resistant sign-in and stronger authenticator design directly map to secure authentication. | |
| Recommendation — Document access-control rules for primary and fallback authentication paths. Use secure authentication methods and evidence their effectiveness in operational use. | ||
| NIST CSF 2.0 | PR.AA-05 — Identity Management, Authentication, and Access Control | The subject is about proving authentication and access control are effective in practice. |
| GV.OV-01 — Oversight of the cybersecurity risk management strategy | The question is fundamentally about governance under regulatory scrutiny. | |
| Recommendation — Validate authentication assurance, exception handling, and access enforcement as one control set. Oversee authentication decisions as part of the bank's risk management strategy. | ||
Practitioner Guidance
What to prioritise: Treat the authentication control as a regulated operating capability. The first question is not which product is strongest, but whether the bank can prove the control is consistent across login, step-up, recovery, and exception handling.
What to verify: Confirm that every alternative authenticator has a defined purpose, an approval path, and a clear limit on when it can be used. If a fallback method would be unacceptable as the primary method, it usually needs explicit governance and tighter scoping.
Decision rule: If the bank cannot explain how a control behaves during device loss, support reset, or customer recovery, it is not yet ready for supervisory scrutiny, even if the core authentication method is phishing-resistant.
Practitioner takeaway: The winning posture is not just stronger authentication, it is defensible assurance, meaning the bank can show that strong authentication remains strong when users, support teams, and operational exceptions enter the picture.
Related resources from NHI Mgmt Group
- How should banks implement phishing-resistant authentication without breaking recovery flows?
- What is phishing-resistant authentication and how does it relate to NHI security?
- Why is it crucial to adopt new authentication methods in MCP usage?
- What is the difference between push-based MFA and phishing-resistant authentication?