When do passkeys reduce risk, and when do they just add another credential type?

Why Passkeys Reduce Risk Only When They Replace Reusable Secrets

Passkeys reduce risk when they remove password reuse, phishing exposure, and shared secret handling from the login path. That benefit is real, but it is limited to the authentication moment. If the organisation still relies on weak enrolment, recovery, or help desk overrides, the attacker simply moves to the weakest link. NIST’s NIST SP 800-63 Digital Identity Guidelines treat authenticators and recovery as separate trust decisions for good reason.

For NHI governance, the lesson is similar to the patterns described in Ultimate Guide to NHIs — Static vs Dynamic Secrets and the Guide to the Secret Sprawl Challenge: replacing one credential type with another does not fix the underlying trust model unless the new factor is harder to steal, replay, or socially engineer. Passkeys help most when they are phishing-resistant, device-bound, and paired with strong identity proofing and recovery controls. In practice, many security teams discover passkey risk reduction only after the fallback path, not the primary login, has already been abused.

How Passkeys Actually Improve the Control Plane

Passkeys work best as a replacement for reusable secrets, not as an extra login option layered beside passwords, SMS, or legacy OTP flows. They reduce attack surface by binding authentication to a cryptographic key pair stored on a device or security element, which makes credential phishing and replay materially harder. That said, the security value depends on the full lifecycle: enrolment, device trust, recovery, revocation, and support processes.

Current guidance from NIST Cybersecurity Framework 2.0 and NIST SP 800-63 Digital Identity Guidelines suggests treating authentication assurance as a system property, not a single feature. That means:

• Use passkeys to replace passwords, not to sit beside them indefinitely.
• Require strong identity proofing before enrolling a new passkey.
• Keep recovery paths at least as strong as the passkey itself.
• Limit support-driven resets and manual exceptions.
• Track device binding, revocation, and cross-device sync risk.

This matters in environments where account takeover often starts with help desk social engineering, compromised recovery email, or a weak backup factor. The same pattern shows up in NHI incidents documented by NHIMG research, including the CI/CD pipeline exploitation case study and the Reviewdog GitHub Action supply chain attack, where the real failure was secret handling and trust boundaries, not the nominal login method. These controls tend to break down in organisations that preserve password recovery as an easier backdoor than the primary authentication flow.

Where Passkeys Add Complexity Instead of Reducing It

Tighter authentication often increases operational overhead, requiring organisations to balance phishing resistance against support burden, device diversity, and recovery risk. That tradeoff is especially visible when passkeys are introduced without removing old credentials or when workforce and customer populations have uneven device support.

Best practice is evolving, and there is no universal standard for passkey lifecycle design across every environment. The most common edge cases are:

• Shared or unmanaged devices, where device-bound trust is weaker.
• Cross-platform environments, where inconsistent support pushes users into fallback methods.
• High-turnover or contractor-heavy access, where recovery workflows become the primary attack path.
• Customer support models that allow too much manual override.

NHIMG research on non-human identity maturity shows why this matters beyond human login, with the 2024 The 2024 Non-Human Identity Security Report reporting that 59.8% of organisations value dynamic ephemeral credentials and that only 19.6% have strong confidence in workload identity management. The same design principle applies: if an identity mechanism does not reduce long-lived secrets and weak fallback paths, it mainly adds another credential type to govern. Passkeys are most effective when they eliminate the old path, not when they coexist with it indefinitely.

Related resources from NHI Mgmt Group

• How should teams reduce the risk from exposed NHI secrets?
• When do scoped roles reduce risk, and when do they just add complexity?
• When does PAM reduce risk, and when does it just add another control layer?
• How should growing companies reduce identity risk as they add more tools and teams?