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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchA successful login proves only that an accepted authenticator was presented at a particular moment. It does not prove that the same person, device, application or automated process should keep accessing every resource for the rest of a session. Modern security therefore treats identity as an ongoing access decision, combining authentication with device health, workload identity, policy, network and data context.
Why a login is no longer a complete security decision
Traditional access models put a large amount of trust in a front door: a username, password and perhaps a second factor. Once those checks succeeded, a session often inherited broad permissions until logout, token expiry or an administrator intervened. That model is poorly matched to cloud services, remote work, application programming interfaces and highly distributed infrastructure.
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Authentication is a point-in-time control. It is useful evidence that an approved authenticator was presented, but it does not establish that every later request is legitimate. A token can be stolen after login. A managed laptop can become infected. A user’s role can change while a session remains active. An application can be compromised even though its operator authenticated correctly. A script can continue calling a service long after the employee who created it has left the organization.
Zero Trust addresses this gap as an architecture and set of implementation principles, not as a product or a demand for a new password prompt before every click. NIST’s SP 1800-35, published in June 2025 and aligned with SP 800-207, describes practical implementation considerations. The central question is whether a particular request should receive access to a particular resource under current conditions.
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What “verify continuously” actually means
Continuous verification does not necessarily mean interrupting users repeatedly. It means that authorization policies can evaluate new evidence as conditions change and can limit, reauthenticate, step up, or revoke access when risk crosses a threshold.
The identity signal
The service evaluates the account, its role, group membership, authentication strength and recent sign-in details. A password-only sign-in and a phishing-resistant sign-in should not automatically receive the same level of trust, especially for administrative operations.
The device signal
Device compliance, encryption, operating-system version, screen-lock status, endpoint protection and evidence of compromise can influence a decision. Microsoft’s overview of federal identity requirements specifically tells agencies to consider device-level signals when authorizing user access.
The application and workload signal
Requests may come from a browser, a native application, a service, a container or a scheduled job. Each needs an identifiable, governable identity. A human account embedded in a script makes ownership, rotation and incident response difficult; a workload identity or certificate can provide a more appropriate control when the platform supports it.
The resource and data signal
Access to a public document, a payroll database and a production control plane should not share one blanket rule. Policies should identify the requested resource, classify the data and apply least privilege to the specific operation.
The network and session signal
Network location can be useful context, but it is not a substitute for identity and device controls. A request from an internal address may still be malicious, while a legitimate employee may work from an unfamiliar network. Session age, token use, impossible-travel indicators and unusual activity can trigger additional checks.
Why MFA is necessary but not enough
Multi-factor authentication requires two or more ways to verify identity, and the Cybersecurity and Infrastructure Security Agency says any MFA is better than none. However, methods differ significantly in their resistance to phishing and interception.
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|---|---|---|---|
| Password only | Low | Easy to deploy, but vulnerable to reuse, guessing and phishing | One stolen secret can unlock the account |
| SMS or voice code | Low | Works on many phones, but depends on telecommunications channels | Codes can be intercepted, redirected or entered into a fake site |
| Ordinary push approval | Low to moderate | Convenient, but repeated prompts can lead to accidental approval | Attackers can exploit prompt fatigue and adversary-in-the-middle phishing |
| Number matching | Better interim protection | Requires the user to match a number shown on the sign-in screen | CISA describes it as an improvement over ordinary push, not the final phishing-resistant state |
| FIDO2 security key or passkey | Strong when correctly implemented | Uses a cryptographic credential bound to the legitimate service; deployment and recovery require planning | Does not provide authorization, lifecycle governance or continuous access decisions by itself |
Phishing-resistant authentication prevents a fake sign-in page from collecting a reusable code or password. FIDO2 security keys and passkeys use cryptographic credentials that are scoped to the legitimate service. Microsoft recommends prioritizing FIDO2 or passkey solutions, while NIST’s current authentication guidance, SP 800-63B-4 (2025 edition), provides the current federal reference for authenticator management.
How passkeys and security keys change the login step
With a passkey or FIDO2 key, the authenticator creates or stores a private cryptographic key and proves possession during sign-in. The private key is not sent to the service. A phishing site cannot normally use a credential created for the real service because the credential is bound to the legitimate origin.
Where they help
- They reduce the value of passwords and one-time codes stolen through phishing.
- They can provide a stronger factor for privileged accounts and sensitive applications.
- They can reduce help-desk resets caused by forgotten passwords.
Where they do not help
- A compromised session token may still be usable after authentication.
- An over-permissioned account remains over-permissioned.
- A lost authenticator creates a recovery problem that must be solved without weakening security.
- Service accounts, applications and automated jobs need their own identity controls.
A physical FIDO2 security key can be useful for administrators, high-risk users and recovery operations. Before buying or issuing one, verify identity-provider support, browser and operating-system compatibility, account enrollment limits, replacement procedures and the organization’s recovery policy. The key strengthens authentication; it is not a standalone Zero Trust system.
Identity includes machines, applications and automation
Non-human identities often outnumber employees. Build systems, deployment pipelines, database jobs, bots and integrations may still use a person’s username and a long-lived password. That pattern makes it hard to answer basic questions: who owns the credential, where is it used, when should it expire, and what should happen when the employee leaves?
Find user-based automation
- Inventory scripts, scheduled tasks, integrations, CI/CD pipelines, service accounts and API clients.
- Record the owner, purpose, permissions, storage location, token lifetime and last-use time for each credential.
- Look for secrets in source repositories, configuration files, build logs and shared documents.
Move to workload identities where practical
Microsoft guidance recommends replacing user-based automation with workload identities when the platform supports them. A workload identity represents the application or service, allowing permissions and lifecycle events to be managed independently of an employee. Certificate-based authentication can be an alternative in environments where workload identity federation is unavailable.
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Apply least privilege and rotation
Grant only the API operations and resources required for the job. Set expiration and rotation schedules, monitor use outside expected time windows and disable credentials that no longer have an owner. Emergency access should be documented and separately monitored rather than hidden in a shared account.
A practical modernization plan
1. Classify accounts by risk
Start with administrators, finance and human-resources users, remote-access accounts, developers with production access and identities that can change security policy. Map the services they use and the consequences of compromise. CISA’s recommendation for phishing-resistant MFA is particularly relevant to these high-impact accounts.
2. Establish a recovery path before enforcing stronger MFA
Enrollment and recovery are part of the security design. Define how a new employee receives an authenticator, how a lost key is replaced, how a device is re-enrolled and which staff can approve recovery. Microsoft recommends temporary access passes for time-bound onboarding and recovery. Make those passes short-lived, auditable and restricted to the enrollment purpose.
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Require phishing-resistant authentication for privileged administrators and other high-risk populations before expanding to the entire workforce. Keep a documented exception process with an expiration date. Do not call every push notification or text message phishing-resistant.
4. Add device and session conditions
Connect identity policy to device-management and endpoint signals. A valid user on an unmanaged or compromised device may need blocked access, read-only access or a step-up check. Re-evaluate long sessions and sensitive actions instead of assuming that the initial sign-in remains sufficient.
5. Replace human credentials in automation
Prioritize production scripts, cloud deployment jobs and integrations with broad permissions. Assign an accountable owner, move to workload identity or certificates where appropriate, reduce scope and monitor anomalous use.
6. Apply resource-specific authorization
Separate authentication from authorization. After verifying the caller, evaluate whether that identity may perform the requested action on the requested resource. Use role-based or attribute-based policies, approval workflows for exceptional access and just-in-time elevation for administrative tasks.
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7. Measure control coverage, not login volume
Useful indicators include the percentage of privileged accounts using phishing-resistant methods, the number of unmanaged service credentials, the age of standing administrative permissions, recovery events, stale identities and policy decisions involving device context. A high MFA enrollment rate can conceal weak methods and excessive permissions.
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“We enabled MFA, so the identity problem is solved.”
MFA protects the authentication event, not every later request. Add token monitoring, device posture, least-privilege authorization and session controls.
“Every MFA method offers the same protection.”
Separate phishing-resistant methods from codes and approval prompts in policy and reporting. Use number matching as an interim improvement where stronger methods cannot yet be deployed, while setting a migration target.
“We will handle recovery later.”
Users who cannot recover an authenticator will seek workarounds, and support staff may bypass controls under pressure. Test lost-device, replacement-key and employee-offboarding procedures before broad enforcement.
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“Service accounts are not real identities.”
Any credential that can request a resource is an identity in the access model. Inventory it, assign ownership, constrain permissions and monitor its use.
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“Zero Trust means asking for a password at every step.”
Zero Trust is a policy and architecture model, not constant interruption. Use risk, resource sensitivity and changing signals to determine when reauthentication or a new approval is warranted.
“A vendor rollout date is an industry deadline.”
Microsoft announced an Entra-specific passkey-default rollout beginning September 1, 2026. That is a service change for that environment, not a universal deadline for every organization or identity platform. Confirm current provider documentation and your tenant’s capabilities before setting a migration date.
How to choose controls for different populations
| Population or identity | Priority control | Additional considerations |
|---|---|---|
| Privileged administrators | Phishing-resistant MFA, separate admin accounts and just-in-time elevation | Keep recovery credentials offline or tightly controlled; review every elevated action |
| General employees | Phishing-resistant passkeys or keys, with managed-device checks | Provide accessible enrollment, replacement and travel procedures |
| Contractors and partners | Federated identity with explicit lifecycle and conditional access | Set end dates, sponsor ownership and restrictions on sensitive resources |
| Applications and services | Workload identity or certificate-based authentication | Remove embedded user passwords, rotate credentials and monitor machine behavior |
| Break-glass accounts | Strong, separately monitored credentials with documented emergency use | Test access without making the accounts part of routine administration |
The policy questions that matter most
- What resource is being requested, and how sensitive is it?
- Which identity is making the request: a person, application, device or service?
- How strong and recent was the authentication?
- Is the device known, managed and free of relevant compliance failures?
- Does the account still need this permission, and is the permission broader than the task?
- Has behavior, location, token use or session age changed enough to require another check?
- Can the organization revoke access quickly when a device, credential or workload is compromised?
What a durable identity strategy looks like
Microsoft’s overview of OMB Memo 22-09 states: “The foundational tenet of the Zero Trust Model is that no actor, system, network, or service operating outside or within the security perimeter is trusted. Instead, we must verify anything and everything attempting to establish access.” In practical terms, that means treating the login as one input to a decision rather than the decision itself.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThe strongest programs combine phishing-resistant authentication, workable recovery, managed devices, application and workload identities, narrowly scoped authorization, continuous monitoring and rapid revocation. They also recognize operational limits: older applications may not support passkeys, contractors may use unmanaged devices, and automation may need certificates while a platform migration is underway. Progress is measured by reducing ungoverned access paths, not by adding prompts.
A FIDO2 key or passkey can close a major phishing gap. It cannot decide whether an authenticated person should download a sensitive file, whether a deployment job should change production or whether a former employee’s token should remain valid. Those decisions require identity lifecycle management and resource-aware policy across users, devices, applications, workloads, networks and data.
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