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TOTP relies on a shared secret. With Google Authenticator, the secret is shared between your phone and the SSH server you're logging into. With Duo, the secret
by teraflop 11y ago
TOTP relies on a shared secret. With Google Authenticator, the secret is shared between your phone and the SSH server you're logging into. With Duo, the secret is shared between your phone and Duo's API backend; the server has no independent way of authenticating it.