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Today we’re diving into the wave of enthusiasm around passkeys and why that enthusiasm might be a trap for regulated organizations.
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Passkeys promise a password-less experience that feels frictionless, but the reality is that they rely on device-bound credentials that can be exploited by sophisticated adversaries.
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Can you walk us through how a passkey actually works, from the moment a user registers to the instant they authenticate?
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When a user registers a passkey, a cryptographic key pair is generated locally on the device. The public key is stored on the service provider, while the private key remains encrypted on the device.
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Authentication occurs when the device signs a challenge from the service, and the provider verifies the signature using the stored public key.
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So because no secret travels over the network, passkeys avoid phishing and credential stuffing, right?
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Exactly, that’s one of the key selling points. But the security of the private key depends entirely on the integrity of the device and the strength of its local encryption.
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If an attacker gains access to the device or its encryption keys, the passkey can be used to impersonate the user without any other verification.
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That’s why device-centric risks are a major factor to consider. Regulated organizations often deploy a mix of corporate laptops, personal mobile phones, and government-issued hardware.
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Each device type presents distinct risk factors: corporate laptops may be managed by an endpoint management system, but they can still be compromised through supply-chain attacks or malware that exfiltrates encryption keys.
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Personal mobile phones are typically outside the scope of enterprise controls, increasing the likelihood of insecure storage or loss.
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Government-issued hardware may have hardened security, yet the proliferation of edge devices introduces new attack surfaces.
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So if the passkey lives on a compromised device, the entire chain collapses.
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Exactly, and that’s why the assumption that passkeys eliminate the need for MFA is misplaced.
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Traditional MFA solutions, like TOTPs or hardware tokens, add an independent layer that can still be verified even if the first credential is compromised.
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Passkeys, on the other hand, provide a single point of trust: the device. If that device is compromised, the whole authentication chain collapses.
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Zero-trust authentication treats every request as potentially hostile, continuously verifying user, device, and context before granting access.
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That continuous verification includes device posture checks that confirm the device meets security baselines, contextual analysis of origin, time, and location, and behavioral analytics that spot anomalies.
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So even if a passkey is used, the zero-trust model still layers additional checks.
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Layered MFA integration means that when a passkey is deployed, you can still require a biometric prompt or a hardware token as a second independent verification step.
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Adaptive authentication also comes into play, adjusting the verification requirements based on risk.
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For example, a login from an unfamiliar device or an unusual location might trigger a secondary factor, while a routine access from a known corporate laptop could pass with just the passkey.
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That dynamic approach sounds like a good balance between user experience and security.
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It also aligns with the continuous monitoring requirement that many compliance frameworks mandate.
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Speaking of compliance, how do passkeys fit into frameworks like NIST SP 800-171 or PCI DSS 4.0?
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NIST SP 800-171 requires multifactor authentication for remote access to controlled unclassified information and continuous monitoring of authentication events to detect anomalies.
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Passkeys technically qualify as a multifactor credential, but they don’t inherently provide the continuous monitoring or contextual risk assessment that the standard expects.
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Without adding device posture checks or behavioral analytics, a passkey-only approach could fall short of the intent of NIST SP 800-171.
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CMMC emphasizes strong identity and access management practices, especially at higher maturity levels where continuous monitoring and adaptive authentication are required.
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If a passkey implementation lacks device posture checks or behavioral analytics, it may not satisfy the higher maturity levels of CMMC.
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What about HIPAA? Patient data is a high-stakes environment.
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HIPAA’s Security Rule requires multifactor authentication for electronic protected health information. A passkey that allows single-factor access from an unmanaged device could expose ePHI to unauthorized parties, violating the rule.
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PCI DSS 4.0 also has a strong stance on authentication.
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While passkeys can be considered a strong credential, the standard requires that authentication methods be regularly tested and that risk-based authentication be employed.
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A passkey implementation that does not incorporate risk scoring may not meet PCI DSS expectations.
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So the core issue is that passkeys alone don’t provide the continuous, contextual, and layered verification that these frameworks demand.
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Zero-trust authentication, by contrast, treats every request as potentially hostile and continuously verifies user, device, and environment before granting access.
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What does that look like in practice for a regulated organization?
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First, you start with device posture checks that confirm the device meets security baselines. That includes patch status, encryption status, and endpoint protection.
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Second, you apply contextual analysis of the request origin, time, and location. If a login comes from a new country or an unusual time, the system can flag it for review.
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Third, you integrate behavioral analytics that learn typical user activity patterns and detect anomalies.
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How do you combine passkeys with other factors in a zero-trust architecture?
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You treat the passkey as one factor, and then you enforce a second factor that is independent, such as a biometric prompt or a hardware token, especially for high-risk systems.
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What about organizations that must satisfy NIST SP 800-171 or CMMC? Do they need to layer passkeys with something else?
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Yes, the zero-trust model requires continuous monitoring and risk-based authentication, so a passkey alone is not enough. You must add device posture checks, contextual risk scoring, and behavioral analytics.
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So the takeaway is that passkeys are not a silver bullet.
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They are a valuable component of a broader, zero-trust authentication strategy when deployed with rigorous device management, continuous monitoring, and layered multifactor controls.
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Given that, what does a regulated organization need to do to ensure passkeys don’t become a compliance risk?
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First, conduct a comprehensive inventory of all authentication methods in use, including passkeys, passwords, and MFA solutions.
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Second, map the specific authentication controls required by applicable frameworks such as NIST SP 800-171, CMMC, HIPAA, and PCI DSS.
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Third, evaluate the passkey implementation risks by reviewing device management policies, encryption strength, and the potential for device compromise.
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That makes sense. What about the zero-trust controls that need to be deployed?
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You need continuous device posture checks, contextual risk scoring, and behavioral analytics. These should be integrated with your security information and event management pipeline.
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And how do we layer MFA with passkeys in this architecture?
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Layer additional factors such as biometric prompts or hardware tokens as a second independent verification step, especially for high-risk systems or when accessing sensitive data.
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What about monitoring and incident response? How does that fit into the zero-trust model?
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Integrate passkey authentication events into your SIEM so you can correlate them with other authentication events. Define response playbooks for anomalies such as logins from new locations or devices.
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That sounds like a lot of work. Do you have any ready-made solutions?
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Petronella Technology Group offers managed XDR services that provide real-time detection and automated response to authentication anomalies across your environment.
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Their virtual CISO services give strategic oversight of your identity and access management program, ensuring alignment with industry best practices.
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That’s helpful. Are there any industry-specific guidance points we should keep in mind?
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For defense contractors, you should ensure all passkey-enabled devices are enrolled in a strong endpoint management system and that devices meet required security baselines before allowing passkey authentication.
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Apply redundancy by requiring an additional factor, such as a hardware token, when accessing high-risk systems, and implement auditability with logging that correlates passkey usage with other authentication events.
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What about healthcare organizations?
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Separate passkey usage for clinical devices from administrative devices, apply stricter authentication for remote access to patient records, and ensure passkey usage can be reported to auditors in a HIPAA-compliant format.
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For legal firms, limit passkey usage to fully managed and encrypted devices and combine passkeys with biometric authentication for access to sensitive case files.
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Deploy continuous monitoring with behavioral analytics to detect unusual access patterns.
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And for financial services?
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Ensure device posture checks before passkey authentication, require adaptive authentication for high-value transactions, and maintain detailed audit trails of passkey events for compliance reporting.
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So the overarching message is that passkeys alone aren’t enough; they need to be part of a broader zero-trust strategy.
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By combining passkeys with disciplined device management, continuous monitoring, and layered multifactor controls, regulated organizations can meet compliance mandates while still providing a frictionless user experience where appropriate.
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What should an organization do next to ensure their passkey strategy is compliant?
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Start by auditing your current authentication landscape, map compliance requirements, evaluate passkey implementation risks, and then deploy zero-trust controls with layered MFA.
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You’ll also need to integrate passkey events into your SIEM, define incident response playbooks, and schedule regular audits to confirm device compliance and policy enforcement.
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That’s a solid framework. Thank you for breaking it down.
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Glad to help. Remember, the key is to treat passkeys as one factor in a layered, zero-trust architecture that meets your compliance obligations.
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Great, we’ll keep that in mind.
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If you need help implementing these strategies, feel free to reach out to Petronella Technology Group for a tailored assessment.
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Thanks for that reminder.
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Happy to help. Have a secure day.
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Let’s dig a bit deeper into why passkeys alone can create blind spots in a regulated environment.
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The core issue is that passkeys tie authentication to a single device. If that device is compromised, the attacker gains a foothold that bypasses other controls.
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So even though the cryptography is strong, the device becomes the single point of failure.
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Exactly. And in many organizations, devices are a mix of corporate laptops, personal phones, and specialized hardware, each with its own risk profile.
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Right. Now, what practical steps can an IT leader take to mitigate those risks?
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First, inventory every device that can store a passkey. Then apply a strict endpoint management policy that enforces OS updates, encryption, and anti-malware.
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That sounds like a foundational requirement. What about personal devices that employees might use?
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For personal devices, consider a bring-your-own-device policy that requires the device to meet a minimum security baseline before you allow passkey registration.
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Can you give an example of a baseline?
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Sure. It might include a supported OS version, up-to-date patches, full-disk encryption enabled, and a reputable endpoint protection suite running.
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Once the devices are vetted, how do we incorporate passkeys into a zero-trust model?
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You layer passkeys with another independent factor. For instance, a biometric prompt or a hardware token that the user must present at each login.
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So passkeys become the first factor, and the biometric or token is the second?
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Yes, that gives you the multi-factor assurance that compliance standards demand.
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You mentioned continuous monitoring earlier. How does that work with passkeys?
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You feed every authentication event into your SIEM, tagging the event with device posture, location, time, and any behavioral signals.
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And then you look for anomalies, like a login from a new country?
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Exactly. You can set thresholds that trigger a secondary factor if the risk score exceeds a certain level.
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What about auditability? Regulators often require detailed logs.
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Make sure your passkey authentication flow writes to a central log that includes the device identifier, the public key used, and the authentication time.
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That satisfies the continuous monitoring requirement of NIST SP 800-171, right?
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It does, provided you also have a process to review those logs for anomalies on a regular basis.
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What are common mistakes organizations make when adopting passkeys?
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A big one is assuming that because passkeys are phishing resistant, you can remove all other factors.
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So you’re still bound to keep MFA?
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Yes. Another mistake is ignoring device management. If a device is lost or stolen, the passkey can still be used unless you have remote wipe or deprovisioning.
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That would be a huge compliance gap.
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Indeed. Lastly, some organizations fail to integrate passkey events into their incident response playbooks.
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Meaning they don’t have a defined response if a passkey is compromised?
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Correct. You need to treat passkey misuse the same way you treat any credential compromise.
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Let’s talk about the specific compliance frameworks. How does passkey usage align with PCI DSS 4.0?
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PCI DSS 4.0 requires strong authentication and risk-based controls. Passkeys can meet the strength requirement, but you must also implement continuous risk assessment and adaptive authentication.
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So you can’t just rely on passkeys for cardholder data access?
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Exactly. You need to combine them with other controls, like transaction limits and monitoring.
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What about HIPAA?
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HIPAA’s Security Rule mandates multifactor authentication for ePHI. Passkeys alone, especially on unmanaged devices, would fall short unless you add another factor and enforce device posture.
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And NIST SP 800-171?
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The standard requires multifactor authentication for remote access to controlled unclassified information. It also calls for continuous monitoring of authentication events, which passkeys alone don’t provide.
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So the zero-trust approach satisfies all of those?
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Yes, because it continuously verifies the user, device, and context, and adapts authentication based on risk.
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Can you outline a quick implementation checklist?
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First, inventory and classify devices. Second, apply endpoint security baselines. Third, enable passkey registration only on compliant devices. Fourth, add a second factor for high-value actions. Fifth, log all authentication events to SIEM. Sixth, set up risk scoring and adaptive triggers. Seventh, review logs regularly and adjust thresholds.
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We need to be careful not to use numbers not in the article, right?
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Yes, we’re sticking to the terms from the source. You can just phrase it as a series of steps.
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What about user education? Do employees need to know something special?
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They should understand that passkeys are device-bound and that losing the device or having it compromised is a credential breach. They need to report lost devices immediately.
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Do you see any industry-specific nuances?
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Defense contractors often use government-issued hardware, so you should verify that the hardware complies with the required security baseline before allowing passkey usage.
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Healthcare providers?
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They should separate passkeys used for clinical devices from those used for administrative access, and enforce stricter checks for remote patient record access.
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Legal firms?
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Limit passkey usage to fully managed devices and add biometric confirmation for accessing privileged case files.
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Financial services?
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Implement device posture checks and require an extra factor for transactions above a threshold or when accessed from a new location.
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You mentioned behavioral analytics earlier. What does that entail?
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It involves monitoring patterns like typical login times, locations, and device types, then flagging deviations that could signal compromise.
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So if someone logs in from a new country, you might ask for a second factor?
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Exactly. That’s adaptive authentication in action.
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Do people often ask if passkeys can replace all other MFA methods?
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Yes, and the answer is no. Passkeys can be one factor, but you should not rely on them exclusively.
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What about the question of device loss?
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If a passkey device is lost, you need a deprovisioning process that revokes the passkey and forces re-registration from a secure device.
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And audit questions?
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Auditors will want to see evidence that passkey usage is logged, that device compliance is enforced, and that you have a response plan for passkey compromise.
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How do you ensure that your logging meets the audit requirements?
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By capturing the device ID, the public key, the authentication timestamp, and any risk score associated with the event.
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Do you have any final advice for listeners who are just starting to think about passkeys?
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Treat passkeys as a tool, not a silver bullet. Build a zero-trust framework around them, enforce device security, layer multiple factors, and continuously monitor and adapt.
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Quick question: if we already have a hardware token solution, can we just pair it with passkeys?
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Yes, you can configure the token as the second factor for any passkey authentication, ensuring the token is validated before granting access.
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And what about integration with existing identity providers?
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Most modern identity providers support WebAuthn and can handle passkey registration, but you’ll need to enable the policy that requires device compliance checks before allowing the passkey flow.
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Thanks again for clarifying all of this.
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Happy to help. Have a secure day.
