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Behind the 6-digit code: Building HOTP and TOTP from scratch

(blog.dogac.dev)
248 points dogacel | 2 comments | 11 Apr 25 13:06 UTC | HN request time: 0.605s | source
1. coolThingsFirst ◴[15 Apr 25 16:36 UTC] No.43695261[source]▶
What is HMAC i still dont understand this part? Is it RSA encrytion?
replies(1): >>43696344 #
2. dogacel ◴[15 Apr 25 18:00 UTC] No.43696344[source]▶
No, RSA is asymetric, where it has a public/private key pair.

HMAC is symetric, it only has a secret and it can be used to hash values one-way.