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0:07
YouTube
Quick2Knowledge
Your OTP expires in 30 seconds — but nobody stored it anywhere. 🤯
Here's the magic behind it 👇 When you set up 2FA, the server shares ONE secret key with your authenticator app. Just once. That's it. After that? Both sides never talk again. Instead, every time you need an OTP, your app and the server both independently run the same formula: OTP = HMAC-SHA1(secret key + current 30s time window) Time is ...
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