Passkeys vs passwords: what identity teams need to know

At a glance

What this is: This is Keeper Security’s comparison of passkeys and passwords, with the central finding that passkeys materially reduce phishing and breach exposure but do not eliminate mixed-environment identity risk.

Why it matters: It matters to IAM practitioners because authentication policy, recovery flows, and lifecycle controls still have to work across human, NHI, and emerging agentic access patterns when passwordless adoption is partial.

By the numbers:

• A strong password is at least 16 characters long and contains uppercase and lowercase letters, numbers and symbols.

👉 Read Keeper Security's analysis of passkeys versus passwords

Context

Passkeys change the authentication model by replacing shared secrets with cryptographic proof tied to a device and local user verification. That is a meaningful improvement for human identity security, but it does not remove the need to govern fallback authentication, recovery, and cross-device access.

For IAM teams, the real issue is transition management. Most environments will run with passkeys and passwords side by side for some time, which means policy, help desk processes, and account recovery still need to assume mixed authentication methods rather than a clean passwordless end state.

Key questions

Q: How should security teams roll out passkeys without breaking account recovery?

A: Start with high-risk users, then document every recovery and exception flow before broadening adoption. Keep help desk resets, backup methods, and device transfer paths under the same approval and logging standards as sign-in. The goal is to remove password dependence without creating a weaker bypass route.

Q: Why do passkeys reduce phishing risk more effectively than passwords?

A: Passkeys resist phishing because users do not type a reusable secret into a website. The authenticator signs a challenge instead, so a fake login page cannot capture credentials that work elsewhere. That makes the protocol itself a control, rather than relying on users to recognise deception.

Q: What breaks when passkeys are used alongside weak fallback authentication?

A: The programme becomes only as strong as the fallback path. If password resets, backup codes, or help desk overrides are easier to abuse than the passkey flow, attackers will target those routes instead. Passwordless adoption fails when exception handling is less governed than primary authentication.

Q: How do organisations know whether passkey adoption is actually reducing risk?

A: Track the share of accounts that are passkey-enrolled, the proportion of sign-ins still using passwords, and the number of recovery events that bypass the primary factor. If password use remains high or recovery is frequent, the programme is still in transition rather than truly passwordless.

Technical breakdown

How passkey authentication works in practice

A passkey uses asymmetric cryptography. The service stores a public key, while the private key stays on the user’s device or authenticator. During sign-in, the service sends a challenge, the authenticator signs it with the private key, and the response proves possession without exposing the credential itself. This removes reusable shared secrets from the login flow and sharply reduces the value of a stolen server-side record.

Practical implication: identity teams should treat passkeys as a credential architecture change, not just a login convenience feature.

Why passkeys resist phishing better than passwords

Passwords can be typed into a fake site, which is why phishing remains so effective. Passkeys do not require the user to enter a secret into a webpage, so the attacker cannot capture a reusable credential through a spoofed login form. The protection comes from the protocol itself, not user vigilance, which makes passkeys fundamentally different from password-based MFA wrapped around a shared secret.

Practical implication: phishing-resistant authentication should be the default target for high-risk human accounts and sensitive workflows.

Why passwordless adoption still leaves governance gaps

Passkeys are not universally supported, and they are often bound to one device or ecosystem unless a synchronisation layer is used. That creates operational complexity around enrolment, loss recovery, device change, and fallback methods. In mixed estates, the security posture is only as strong as the weakest recovery and exception path, which is where identity programs often accumulate risk.

Practical implication: review fallback authentication, recovery approval, and help desk reset processes before expanding passkey adoption.

NHI Mgmt Group analysis

Passkeys reduce credential theft, but they do not end authentication governance. The article is right to emphasise phishing resistance, yet the practitioner problem is broader than login security. When a programme still has passwords, fallback channels, and shared recovery paths, the attack surface simply moves to the exception process. Identity teams should see passkeys as a stronger primary factor, not as a complete control plane.

Device binding is the point where passwordless convenience becomes lifecycle management. Passkeys are only secure if enrolment, transfer, revocation, and recovery are controlled. That means the IAM conversation shifts from password complexity to identity lifecycle discipline, because a lost device, an unrevoked authenticator, or an overly permissive recovery channel can reintroduce the same exposure passkeys were meant to remove.

Recovery path drift: Passkey programmes were designed for sign-in flows that can verify possession of a bound authenticator. That assumption fails when users, service desks, or backup methods create alternate paths that bypass the passkey itself. The implication is that passwordless security is only as strong as the weakest exception route.

Passkeys also expose a human-to-machine governance overlap that many IAM teams underestimate. The same lifecycle logic used for human authentication increasingly matters when credentials, devices, and synced authenticators become part of a broader identity estate. If access governance cannot model device change, recovery, and fallback consistently, the programme will remain partially password-dependent even after passkey rollout.

From our research:

• 91.6% of secrets remain valid five days after the targeted organisation is notified, showing a critical gap in remediation procedures, according to Ultimate Guide to NHIs.
• 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools.
• Passkey programmes should be paired with lifecycle governance, as covered in Ultimate Guide to NHIs.

What this signals

Passkey adoption will only change programme risk if recovery design changes with it. Identity teams should expect the biggest failures to show up in enrolment, device loss, and support escalation rather than the login ceremony itself. If those paths still rely on weak verification, passwordless becomes a label rather than a control.

Device-bound authentication is a lifecycle problem as much as an authentication problem. Organisations that already struggle with offboarding, recovery, and entitlement cleanup will feel those weaknesses immediately when passkeys become the primary credential. The programme signal is simple: if you cannot govern fallback paths, you do not yet have a passwordless architecture.

Only 5.7% of organisations have full visibility into their service accounts, according to Ultimate Guide to NHIs. That visibility gap is a warning for human identity teams too, because modern access estates increasingly mix people, devices, authenticators, and machine-bound credentials in the same operational chain.

For practitioners

• Map all fallback authentication paths Identify every recovery route that can bypass passkey authentication, including help desk resets, backup codes, temporary passwords, and device-transfer workflows. Remove or tighten any route that still allows password-style compromise of a supposedly passwordless account.
• Prioritise phishing-resistant access for high-risk roles Roll out passkeys first to privileged users, finance teams, and other accounts that are most likely to be targeted by credential theft. Keep passwords only where application support is missing, and document the exception list.
• Treat device loss as an identity event Require a formal process for passkey revocation when devices are replaced, lost, or reassigned. Make sure offboarding and device lifecycle controls remove authenticator trust, not just account access.
• Keep password policy until coverage is complete Maintain strong password standards, MFA, and monitoring for applications that do not yet support passkeys. Do not relax password governance until fallback coverage is verified across the full application estate.

Key takeaways

• Passkeys improve authentication security by removing reusable secrets from the login path, but they do not remove governance risk.
• The main exposure shifts to recovery, fallback, and device lifecycle controls, where weaker processes can undo the protection passkeys provide.
• Teams should keep passwords governed until passkey coverage is broad and every bypass route is reviewed, logged, and tightly approved.

Key terms

• Passkey: A passkey is a phishing-resistant authentication method that uses public key cryptography instead of a reusable password. The private key remains on the user’s device or authenticator, while the service stores only the public key and verifies a signed challenge at sign-in.
• Authenticator: An authenticator is the device or application that proves the user holds the private key during passkey sign-in. In practice, it may be a phone, computer, browser, or password manager, and it becomes part of the identity lifecycle because device loss or change affects access.
• Fallback authentication: Fallback authentication is any alternate path used when the primary login method is unavailable, such as password resets, backup codes, or help desk verification. It is often the weakest part of a passwordless programme because attackers target the exception path when the main flow is protected.
• Phishing resistance: Phishing resistance means an authentication method does not expose a reusable secret that can be stolen through a fake login page or social engineering. Passkeys achieve this by signing a challenge locally instead of asking the user to type credentials into a site.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building identity security capability across human and non-human estates, it is worth exploring.

This post draws on content published by Keeper Security: Passkey vs Password: Which Should I Use? Read the original.