medium10 pts · first answer countsauthenticationmfaotp

How authenticator app codes work

How does a TOTP authenticator app (like Google Authenticator) produce a code that the server can check offline?

A.The server sends the code to the app over the internetB.Both sides compute HMAC of a shared secret and the current 30-second stepC.The app asks the phone carrier for a new codeD.The code is the last 6 digits of the user's password hash

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How authenticator app codes work

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