Teams should complete identity proofing first, so the passkey is bound to the correct person before registration. That typically means verifying the enrollee through a trusted process, then linking the passkey to the authenticated account, often with enrolment controls, step-up verification, and audit logs to prevent account takeovers during setup.
Why identity proofing comes before passkey registration
Passkey setup should start only after the enrollee has been verified, because the security value of a passkey depends on binding it to the right account holder. If registration happens before proofing is complete, an attacker who can influence the enrolment flow can end up enrolling their own authenticator against a legitimate account.
The practical issue is not the cryptography of the passkey itself, but the trust decision made at registration time. A well-run enrolment process confirms who is being onboarded, then attaches the credential to that established identity with enough assurance to support later sign-in and recovery decisions.
For teams rolling out passwordless sign-in, the earliest design choice is often whether the registration event itself is treated as a trust boundary. The answer should be yes: it is the point where an identity is confirmed, a credential is created, and future access is enabled. That is why Passwordless and Passkeys Guide and NIST SP 800-63 Digital Identity Guidelines both matter here, because registration quality and assurance level determine whether the passkey is actually trustworthy.
What a safe registration flow needs to verify
A safe process checks that the person at enrolment is the same person the organisation intends to bind to the account. That may involve identity proofing, a trusted existing login, a help-desk verified step-up, or another approved enrolment path, but the key requirement is that the account is already under controlled ownership before a passkey is added.
Registration controls should also make it hard to substitute a new device or authenticator without detection. Teams should expect audit logs for who approved enrolment, what assurance was used, which account was linked, and whether any recovery or exception path was invoked. Those records matter later if there is an account takeover allegation or a disputed enrolment.
In mature programmes, passkey onboarding is usually tied to broader authentication governance rather than handled as a one-off UI feature. That is why the Authentication Guide and Authentication Maturity Model are useful complements, they help teams place passkey registration inside a wider assurance and recovery model instead of treating it as a standalone sign-up screen.
What goes wrong when enrolment is too loose
If identity proofing is weak, an attacker may exploit recovery, support, or self-service paths to bind a passkey to the wrong account. That can turn a supposedly strong authentication method into a durable takeover path, because the attacker controls the future sign-in factor and may no longer need the original password.
The most dangerous failure mode is a mismatch between the account lifecycle and the authenticator lifecycle. If the account can be created, reset, or recovered without strong identity checks, then passkey registration can become the moment an attacker solidifies access rather than the moment a legitimate user gains safer sign-in.
Teams should also watch for over-reliance on the device event alone. Possession of a new phone, laptop, or security key does not prove the right person is behind it, especially when enrolment can be socially engineered or hijacked through support workflows. The practical control is to verify the person first, then trust the authenticator.
For implementation detail, the FIDO2 and WebAuthn Internals Guide is helpful because it explains what the relying party actually verifies during registration and why ceremony integrity matters as much as the passkey itself.
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, OWASP ASVS and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | IA-12 — Identity Proofing | Passkey binding depends on verifying the enrollee before registration. |
| IA-5 — Authenticator Lifecycle Management | Registration is the authenticator lifecycle event where the passkey is enrolled and bound. | |
| Recommendation — Require trusted identity proofing before issuing or binding a passkey. Control enrolment and audit the creation, binding, and replacement of authenticators. | ||
| OWASP ASVS | V6 — Authentication | Passkey setup is an authentication enrolment flow that must resist account takeover at registration. |
| Recommendation — Verify enrolment, step-up, and recovery requirements for passwordless authentication. | ||
| NIST SP 800-53 Rev 5 | IA-8 — Identification and Authentication (Non-Organizational Users) | The question concerns binding a credential to a user account before access is granted. |
| Recommendation — Apply strong identity proofing before authenticating external users with new credentials. | ||
Practitioner Guidance
What to verify: Before enabling registration, confirm there is a defined proofing path, a named owner for enrolment approval, and a logged link between the verified person and the account being bound. If support can override that path informally, the control is already weak.
Decision rule: If the enrollee has not been trusted through an approved identity process, do not allow passkey binding to proceed, even if the user appears to have a valid device or can complete a one-time code challenge.
What good looks like: Passkey registration happens only after the identity has been established, the enrolment step is auditable, and recovery uses the same or stronger trust standard than initial binding. That is the point at which passkeys strengthen account security instead of just changing the login method.
Practitioner takeaway: Treat passkey registration as a binding event, not a convenience step, because the security outcome depends on who was verified before the authenticator was attached.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on November 9, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org