Passwordless Login

Verify the Human at the
Moment of Login

Replace passwords and OTPs. Issue a session only when your backend can prove the authorized human approved this login now.

Login is a CRITICAL action. Real-time validation required.

CRITICALReal-time validationBackend enforcement
The Problem

Passwordless Does Not Always Mean Provable

Many systems can authenticate a user. Fewer can prove who approved a specific login attempt, at a specific time, with an audit trail your backend can trust.

Session = Authority

A login can be valid, then misused later. You still need proof for sensitive actions and re-authentication rules.

Shared Devices

Device biometrics are not the same as employee identity. You need user-to-device binding and action-time approval.

Remote Control & Automation

Malware and remote-control tools can operate inside a trusted session. Approval must be tied to the action itself.

How It Works

End-to-End Passwordless Login

The app collects approval. The backend enforces it. Yuthent provides the verification layer and signed proof.

Enrollment & Binding (one time)

Bind a real human and a trusted device. Keep biometrics on-device.

Customer App
Yuthent SDK
Yuthent Cloud
Customer Backend
  1. 01
    Customer App → Yuthent SDK
    Start onboarding (e.g., ID + selfie liveness or in-person link).
  2. 02
    Yuthent SDK → Yuthent Cloud
    Register the device and establish trust (no biometrics sent).
  3. 03
    Customer App → Customer Backend
    Link the trusted device to the user account in your system (your user ID stays with you).

Passwordless Login (every time)

CRITICAL login requires real-time validation before a session is issued.

Customer Backend
Customer App
Yuthent SDK
Yuthent Cloud
  1. 01
    Customer Backend → Customer App
    Create a login attempt and send an actionContextId (loginAttemptId).
  2. 02
    Customer App → Yuthent SDK
    Request a CRITICAL approval (actionType: "LOGIN", riskLevel: "CRITICAL").
  3. 03
    Yuthent SDK → Yuthent Cloud
    Generate proof and perform real-time validation (online required).
  4. 04
    Customer App → Customer Backend
    Send the proof reference (e.g., proofId) with the loginAttemptId.
  5. 05
    Customer Backend → Yuthent Cloud
    Verify the decision before issuing a session token.
  6. 06
    Customer Backend → Customer App
    Issue the session only if the approval is verified.
Backend Enforcement

Your Server Is the Gatekeeper

The app should never be the source of truth. Your backend enforces login by verifying the approval with Yuthent.

Verify Before Session

Issue a session token only after the login approval is verified.

Signed Proof for Audit

Store proof references and decisions for audits and incident response.

No Biometric Data

Biometric data stays on the device. Your backend sees decisions and proofs, not biometrics.

Want This Login Flow in Your App?

We help your team integrate the SDK and enforce CRITICAL login approvals on your backend.