My Weird Prompts

How Your Password Manager's 6-Digit Code Actually Works

22 min · Gestern
Episode How Your Password Manager's 6-Digit Code Actually Works Cover

Beschreibung

Ever wonder how your authenticator app generates a new six-digit code every thirty seconds without ever contacting the server? The answer is more elegant than you'd expect. In this episode, we break down the TOTP algorithm — from the HMAC-based one-time password foundation to the dynamic truncation step that turns a cryptographic hash into a six-digit code. We explain why clock drift causes those panic-inducing moments when every code fails at once, and why SHA-1's known weaknesses don't actually matter for TOTP security. If you use two-factor authentication, this is how it really works under the hood.

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