Posts tagged

#authentication

2 posts

TOTP: Why the Authenticator Code Is Right Even When Your Phone Is Offline

SMS and email OTPs are deliveries — they need a network, a SIM, and a mailbox nobody else owns. TOTP is a computation. Here is what makes it work on a plane at 38,000 feet.

Sep 9, 2026 Security

TOTP Demo

An interactive playground for time-based one-time passwords. Generate a secret, scan the QR with your own authenticator app, watch the six digits roll over every thirty seconds, and verify what your phone produces. Every code is computed in the browser with the Web Crypto API — the page makes no network calls at all.

totpauthenticationjavascript

Demo