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Message-Id: <C4F01063-0313-46A8-B2B0-0023013F30E5@bluepopcorn.net>
Date: Fri, 29 Mar 2019 17:49:39 +0100
From: Jim Fenton <fenton@...epopcorn.net>
To: passwords@...ts.openwall.com
Subject: Re: UX/security of TOTP configuration process
Many TOTP agents have mechanisms for transferring the secret from one device to another (for example, when a user’s smartphone is replaced). This is somewhat out of control of the application using TOTP (and unfortunately some of these applications do not do this transfer in a fully 2FA manner, but again that is out of the application’s control).
But I think it’s good to provide one-time recovery codes in case the user can’t transfer the recovery secret.
-Jim
> On Mar 29, 2019, at 5:03 PM, Anton Dedov <adedov@...il.com> wrote:
>
> Hello folks!
>
> A question on implementing TOTP 2FA in an application.
>
> Is it ok to ask users to backup TOTP secret in a secure place during 2fa configuration process? Or it's better to provide one-time recovery codes?
>
> The argument against TOTP secret backup can be an assumption that if the secret leak it can be maliciously used without victim user ever noticing it.
>
> --
> Anton Dedov
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