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Identity Authority
Category: Authentication Factors

Authentication Intent

Also known as: Authentication Intention, Intent-Based Authentication
Simply put

Authentication intent is a security measure that requires a person to take a deliberate, explicit action each time they authenticate, proving that a real user is present and consenting to the login. This helps defend against malicious software on a device that might otherwise try to authenticate silently on the user's behalf without their knowledge.

Formal definition

Authentication intent is a property of an authentication process in which the claimant must respond explicitly to each authentication or reauthentication request, per NIST SP 800-63B. Its primary purpose is to serve as a countermeasure against endpoint malware that could otherwise act as a proxy to authenticate an attacker without the subscriber's knowledge. Because it establishes deliberate user participation at the moment of authentication, intent is an authentication-time control and does not, by itself, determine what the authenticated principal is authorized to do; that remains a separate authorization decision. Note that some vendor and research usages extend the term toward binding intent to a specific action or outcome (for example, gesture-based approvals or intent-based authorization), but such formulations blend authentication and authorization semantics and fall outside the core NIST definition of intent as an explicit per-request response.

Why it matters

Endpoint malware is one of the more difficult threats to counter at authentication time, because compromised software running on a trusted device can attempt to drive the authentication process without the user's awareness. Authentication intent addresses this specific risk by requiring the claimant to respond explicitly to each authentication or reauthentication request, per NIST SP 800-63B. By demanding a deliberate human action, intent raises the bar for malware that would otherwise act as a proxy to authenticate an attacker without the subscriber's knowledge.

The control matters because it targets a gap that other authentication properties do not directly close. A possession-based authenticator, for example, may remain connected to a compromised endpoint and be exercised silently; requiring explicit per-request participation makes that silent use materially harder. In most deployments, authentication intent is treated as one layer among several rather than a standalone defense, and its effectiveness depends on the specific action required and how difficult that action is for malware to simulate.

It is important to keep intent scoped correctly. As an authentication-time control, it establishes that a real user is present and consenting at the moment of authentication; it does not, by itself, determine what the authenticated principal is subsequently authorized to do. Some vendor and research usages extend the concept toward binding intent to a specific action or outcome, but those formulations blend authentication and authorization semantics and fall outside the core NIST definition.

Who it's relevant to

Security Architects
Architects evaluating defenses against endpoint compromise should treat authentication intent as a targeted countermeasure against malware acting as a proxy to authenticate an attacker without the subscriber's knowledge. It is best positioned as one layer within a broader authentication design rather than a complete solution, and its value depends on how difficult the required explicit action is to simulate on a compromised device.
IAM Engineers
Engineers implementing authenticators need to understand that demonstrating intent, per NIST SP 800-63B, requires the claimant to respond explicitly to each authentication or reauthentication request. When selecting or configuring authenticators, they should verify whether a given method actually enforces an explicit per-request response and avoid conflating intent with authorization decisions that occur separately.
Compliance Officers
Those mapping controls against NIST SP 800-63B should recognize authentication intent as a defined authentication-time property with a specific purpose: countering silent, malware-driven authentication. Documentation should keep intent distinct from authorization requirements, and should note that extended vendor formulations binding intent to specific actions or outcomes fall outside the core NIST definition.

Inside Authentication Intent

Explicit User Action
A deliberate, user-initiated gesture that signals intent to authenticate or authorize an operation, such as a physical touch on a security key, a biometric confirmation, or a button press, rather than a background or automatic process.
Test of User Presence
A mechanism confirming that a human is present and actively participating at the moment of authentication. In FIDO2/WebAuthn contexts this is often satisfied by a user presence (UP) check, which is distinct from verifying who the user is.
Relationship to User Verification
Authentication intent (presence) is a separate concept from user verification (UV), which establishes identity through a factor such as a PIN or biometric. Intent can be demonstrated without full user verification, depending on the authenticator and configuration.
Transaction Confirmation
In step-up or transaction-binding scenarios, intent may be captured for a specific operation (for example, confirming a particular payment) rather than for a general session, tying the user's deliberate consent to a defined action.
Anti-Automation Property
By requiring a fresh, deliberate human gesture, authentication intent helps resist silent, scripted, or remote-triggered authentication attempts that occur without the account holder's knowledge.

Common questions

Answers to the questions practitioners most commonly ask about Authentication Intent.

Is authentication intent the same thing as multi-factor authentication?
No. MFA verifies who a principal is by combining factors from different categories (possession, knowledge, inherence), while authentication intent is a separate signal confirming that a present human deliberately chose to authenticate or authorize a specific action. You can satisfy MFA without capturing intent, and depending on configuration you can capture intent as part of a single factor. They address different concerns: MFA strengthens identity verification, whereas intent guards against a credential or authenticator being exercised without the user's conscious, deliberate participation.
Does requiring a user gesture like a tap or button press automatically prove authentication intent?
Not necessarily. A deliberate gesture is a common way to signal intent, but the strength of that signal depends on the design. In most deployments, a gesture demonstrates that some human interacted with the authenticator, but it may not establish that the user understood which action or relying party they were approving. Whether a gesture reliably conveys intent depends on how the ceremony binds the gesture to a specific request and how clearly the context is presented to the user; the gesture alone is not sufficient in all cases.
How can authentication intent be expressed in a WebAuthn or FIDO2 ceremony?
In WebAuthn and FIDO2, user presence and, where configured, user verification are typically conveyed through flags in the authenticator's signed response. A user-presence check generally requires a simple physical interaction, while user verification adds a knowledge or inherence check. Whether these map to your definition of intent depends on how you interpret and act on those flags. This entry does not assert specific flag names or protocol version behavior beyond noting that the relying party validates the returned attestation or assertion; consult the relevant WebAuthn specification for exact semantics.
When should I require an explicit intent confirmation as part of step-up authentication?
Explicit intent confirmation is often applied to high-consequence actions such as changing security settings, approving large transactions, or granting elevated access. In these cases a step-up flow can combine stronger authentication with a request-specific approval that presents the action's details to the user. Depending on configuration, you may bind the intent signal to the specific transaction so that approval cannot be replayed for a different request. The threshold for requiring intent confirmation is typically driven by risk policy rather than by the authentication mechanism itself.
How does authentication intent relate to authorization decisions at the PDP?
Authentication intent is a signal established during the authentication ceremony, whereas an authorization decision is made at runtime by a policy decision point evaluating who the principal is against what they may do. An intent signal can be surfaced to the PDP as an attribute or claim, allowing policy to require confirmed intent for certain actions. However, intent itself does not grant access; it is one input the authorization layer may consider. Keeping the two separate avoids conflating verification of a deliberate action with the permission to perform it.
How can an intent signal be conveyed to a relying party in a token?
In OIDC-based flows, information about how authentication occurred is typically conveyed through claims such as authentication context references, and an intent-related indicator could be represented as a claim within an ID token, depending on how the identity provider is configured. Because such a claim is carried in a signed token, the relying party can validate its integrity, but note that signing establishes authenticity and integrity, not confidentiality. The exact claim names and their availability depend on the provider, profile, and deployment; this entry does not assert a standardized claim for intent.

Common misconceptions

Authentication intent is the same as user verification or authentication itself.
Intent (typically a test of user presence) only confirms that a human deliberately acted; it does not by itself verify identity. User verification, which establishes who the user is via a knowledge or inherence factor, is a separate step and may or may not accompany the intent gesture depending on configuration.
Any successful authentication necessarily proves the user intended it.
Without an explicit presence or confirmation gesture, authentication can potentially proceed through silent or automated flows. Demonstrating intent specifically requires a deliberate human action tied to that authentication event, which not all mechanisms enforce.
Authentication intent covers authorization decisions for what the user may do.
Intent relates to confirming a deliberate human action during authentication or transaction confirmation. It does not determine a principal's permissions; authorization is a distinct step handled by access control models and enforcement points.

Best practices

Treat authentication intent (user presence) and user verification as distinct requirements, and explicitly configure which is required for each authentication context rather than assuming one implies the other.
Require a fresh, deliberate user gesture for sensitive or high-risk operations, using step-up authentication or transaction confirmation to bind intent to the specific action being authorized elsewhere.
Where supported by FIDO2/WebAuthn authenticators, define whether a user presence check alone is sufficient or whether user verification must also be satisfied, and document this per relying party.
Avoid silent or fully automated authentication flows for operations that carry meaningful risk, so that a human gesture confirms the account holder's participation.
Verify that your chosen authenticators and platform actually enforce the intent signal you rely on, since behavior varies by authenticator, vendor, and deployment configuration.
Log and audit intent-related signals separately from identity verification results so that reviews can distinguish who authenticated from whether a deliberate human action was present.
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