Identity & MFA
How passwordless sign-in, MFA, and device verification work.
10 articles
How authentication works
A signed challenge from your device key, gated by biometrics — not a password.
MFA and device verification
Not a code from an app — a signature-derived one-time value tied to your device identity.
How authorization works
The signature isn't proof you logged in once — it's proof you approved this exact action.
Test authentication before production
Verify the happy path and the failure paths before real users hit them.
Troubleshoot MFA enrollment
Common problems while setting up MFA and device verification for the first time.
MFA reset and recovery
If you still have your backup, this is self-service. If you don't, here's what to expect.
Change or replace an authentication factor
Moving to a new device replaces your authentication factor — here's how.
Respond to a suspected compromised account
Rotate what can be rotated, re-establish your identity, and escalate if needed.
Set up MFA on your support account
Turn on PTERI-verified 2FA for your support.kakr.ai account in under a minute.
Phishing-resistant authentication overview
Why there's no password or OTP code for a phishing page to capture in the first place.
Still need help?
Kai answers instantly from this knowledge base. If it can't resolve your issue, it hands you to the Kakr Labs support team.