HMAC explained | keyed hash message authentication code
6:33
YouTubeJan Goebel
HMAC explained | keyed hash message authentication code
🔥More exclusive content: https://productioncoder.com/you-decide-what-we-build-next Twitter: https://twitter.com/_jgoebel Blog: https://productioncoder.com Website: https://jangoebel.com In this video we cover what HMAC (keyed hash message authentication code) is and where it is used in the IT world. We also clarify the HMAC vs hash question ...
86.4K viewsMar 22, 2021
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Nishchal Baghele on Instagram: "Ever wondered how Authenticator apps create 6-digit codes every 30 seconds — even offline? 🔐 • It’s not random, it’s TOTP (Time-based One-Time Password) — defined in RFC 6238 ⚙️ • When you scan that QR code, it stores a secret key shared with the server 🧩 • Your phone divides the current Unix time by 30 → gets a time window ⏱️ • Then it runs: HMAC_SHA1(secret, timeWindow) → produces a 20-byte hash 🔢 • Extracts 4 bytes using dynamic truncation, converts to a 31-
0:08
Nishchal Baghele on Instagram: "Ever wondered how Authenticator apps create 6-digit codes every 30 seconds — even offline? 🔐 • It’s not random, it’s TOTP (Time-based One-Time Password) — defined in RFC 6238 ⚙️ • When you scan that QR code, it stores a secret key shared with the server 🧩 • Your phone divides the current Unix time by 30 → gets a time window ⏱️ • Then it runs: HMAC_SHA1(secret, timeWindow) → produces a 20-byte hash 🔢 • Extracts 4 bytes using dynamic truncation, converts to a 31-
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