Time-Based One-Time Password Algorithm Explained (TOTP)

Time-Based One-Time Password Algorithm Explained (TOTP)

I have been using google authenticator for a while and decided to have a look into how the Time-Based One-Time Password Algorithm works. Authenticators like the google one use the TOTP algorithm which is a fairly simple open standard. TOTP is an extension of the hash-based message authentication code (HMAC). It works by combining a secret key with the time …

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