Hmh, I guess, though I feel this is a bit more complicated. What if you can look up the username in the registration mail sent to the inbox? Or it’s a site that uses email addresses as usernames? Is it knowing if said knowledge is inferrable from the thing you have?

DacoTaco
link
fedilink
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I think you got it wrong what i meant (?)
Imagine i register on a website with my username ( DacoTaco ) and email ( someEmail@domain.com ). When i want to reset my password and click the “forgot password” link, it would ask my username, not my email address (something i know) and send me an email ( to someEmail@domain.com ) without reporting what email it sent it too. That way it could be considered a separate identity factor i think (access to the mailbox, something you have ).
Websites generally dont work this way, i know. But thats how id implement it :')

Thanks for clarifying. I was mostly trying to apply that scenario to a likely real world one, but there’s definitely cases in which it could be two factor.

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