Bifalgorithm post

Your authenticator app doesn't need the internet. Here's why. Turn on airplane mode. No Wi-Fi, no mobile data. Now open Google Authenticator, Microsoft Authenticator, or any similar app. The six-digit code still changes every 30 seconds. And if you try that code on the website, the server can still accept it. So how are your phone and a server somewhere else generating is not downloading six digit codes from the server. It generates them locally and the server independently generates the same expected code using the same secret, the same time window and the same algorithm.

Your authenticator app doesn't need the internet. Here's why. Turn on airplane mode. No Wi-Fi, no mobile data. Now open Google Authenticator, Microsoft Authent…