Might be better off looking at https://jira.atlassian.com/browse/CWD-677
It's not that your request is wrong (I'm not fond of two factor authentication, as I've seen it compromised far too easily because people tend to implement really bad ways of doing it, or do it for the wrong reasons. Most worryingly, it's banks...), but that Confluence and other Atlassian systems use Crowd to handle users. Even if you're just using Confluence, it's got a mini-crowd embedded in it. So adding this to Crowd would solve the problem for all the Atlassian products, not just one.
You've missed the point - there's no point voting on a fix for Confluence which would make Atlassian have to re-invent a wheel several times, when they can simply do it in Crowd and deal with it in all their products in one go. I'm not trying to discourage you, I'm just pointing out that there's a better place to fix it and an existing request for the functionality which is more likely to engender support, and I'm pretty sure it's the solution Atlassian will look at first.
Actually, 2 factor is just as weak as passwords, if it's badly implemented, and that happens a LOT. That's not the discussion here (which is why I braced it - it's an opinion, not really that relevant, although I mentioned it because people wave it around as a solution for all sorts of things it really won't fix)
It's because I've got a bit of a niggle with the voting system in Jira. When issues are closed as duplicates (as this one probably should be), the votes don't get moved to the open issue. I just think it's worth voting on the issue that would get more attention, and not killed off as a duplicate. I've seen many cases where there's a swathe of unloved issues with a couple of votes each, but adding up the (unique) voters would have propelled them well into the lead.
Of course, I can see you didn't know that it's probably a duplicate, and despite that, it's still worth having so that anyone looking for Confluence + two-factor will end up in the right place.
For Confluence server, you can check out the benefits of our new 2FA Confluence add-on for two-factor authentication using your SecSign ID.
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