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Put simply: the device that holds your TOTP secret should never hold your password if your aim is genuine two factor security.

Furthermore, you should not use the regular password for the site on the same device that holds your TOTP secret. If you would like to turn a site’s offering of TOTP into true two-factor security, you should not store your TOTP secret in 1Password (or in anything that will synchronize across systems). Although that should not apply to 1Password users, there are other benefits to one time passwords as I discussed above.

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In particular, many of the sites and services that offer or require two-step verification with one time passwords are doing so because many of their users have weak or reused passwords. The security that such sites seek to gain from this is not in the second-factorness it is in the one-timeness. In general, there is a reason why many services that offer TOTP refer to it as “two-step verification” instead of as “second factor authentication”. But if she is also using Tumblr from her phone and has had to use her one time password from there, then there is no second factor. If she never logs into to Tumblr on the same phone, then she is using her phone as a second factor. So far, she has been using the Authy app on her phone to manage TOTP. Molly has a Tumblr where she posts pictures of the squirrels she is after. To be truly second factor, the TOTP secret (from which the one time password is generated) must not be stored on the same device that you use the regular password on. Systems like TOTP are sometimes used as part of second (or multi) factor authentication systems. However, you still have the benefits of the one-timeness of TOTP codes. Indeed, when you store your TOTP secret in the same place that you keep your password for a site, you do not have second factor security. One time passwords are often part of second factor security systems, but using one time passwords doesn’t automatically give you second factor security. We need to make the distinction between one time passwords and second factor security. In this way, TOTP provides a meaningful defense against plausible attacks even though there is nothing “second factor” about how it is being used. The point of one-time passwords is that they are not reusable even if they are captured in transit. That is one of several ways that passwords can be captured in transit.

This way, Mr Talk can capture Molly’s passwords in transit to the servers and save them for later use. I should probably point out that Molly lacks the discipline to pay close attention to anything other than a squirrel or rabbit. If Molly isn’t paying close attention to the HTTPS status of her browser’s connection, she can send things unencrypted over Mr Talk’s network while thinking it is a secure connection. Mr Talk is using SSL-strip on his rogue wifi hotspot.

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Airport Free Wifi was actually a laptop operated by Mr Talk, our neighbor’s cat. As it turned out, BVT-access was the legitimate one, but she connected to Airport Free Wifi. One was BVT-access, and the other one was “Airport Free Wifi”. When she connected to Wifi, she saw several open wifi IDs. Recently Molly (my other dog) was at the Barkville Airport.

heed browser warnings about such connectionsīut networks are easy to compromise.

pay attention to the lock icon in your browser’s address field (indicating HTTPS).

use HTTPS instead of HTTP when doing anything sensitive.

Ideally, that connection is well encrypted so that the password cannot be captured when it is in transit. Normally, when you submit a password to a site or service, you send the same password each time. One-time passwords (the “OTP” in “TOTP”) are useful over insecure networks. Clearly, she could use TOTP more securely if it were available for the Login item within 1Password. Ideally, it should only be visible when she actually needs it, but she is understandably just trying to save time. It’s sitting there ticking away all the time her laptop is running. She has set up an app on her laptop that just constantly displays the current TOTP code.