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There is no sync to provider servers on any TOTP implementation I use. Nor does a TOTP implementation need to be an application on a phone. Are you perhaps refe
by gkbrk 4y ago
There is no sync to provider servers on any TOTP implementation I use. Nor does a TOTP implementation need to be an application on a phone. Are you perhaps referring to the Google Authenticator or the Microsoft Authenticator apps when you refer to TOTP?
Manufacturers that sell the "meaningful" 2FA hardware tokens can manufacture and sell duplicate keys, they even provide this as a service when you want backup keys. What makes you think they don't "securely" make a few duplicates themselves?
- mdb31 4y ago> There is no sync to provider servers on any TOTP implementation I use That's hard to dispute, but will you accept https://guide.duo.com/duo-restore https://guide.duo.com/duo-restore as a counterexample? > Are you perhaps referring to the Google Authenticator or the Microsoft Authenticator apps when you refer to TOTP No, I'm referring to the actual RFC 6283 TOTP protocol. Which uses a trivially-cloned single private key. Which is, see the example above, in fact trivially cloned 'for convenience' by at least one widely-used 'enterprise' security solution. > What makes you think they don't "securely" make a few duplicates themselves? Since that literally makes no sense if you know how hardware tokens work.