Rana Tahir Bilal on Instagram: "🤔 Ever wondered how Google or Microsoft Authenticator creates 6-digit codes every 30 seconds — even offline? Let’s decode it! 🔥 ⸻ 1️⃣ 🔐 Core Concept (2FA) • Based on TOTP (RFC 6238) — Time-based One-Time Password • Uses shared secret + current time • New 6-digit code every 30 seconds 💡 Even if your password leaks, hackers can’t log in without this code! ⸻ 2️⃣ 📱 QR Setup (Provisioning) • Server generates a Base32 secret → JBSWY3DPEHPK3PXP • Converts it into ot