I think bug 34911 is a better idea.

(In reply to Kunal Mehta (Legoktm) from comment #1)

I think bug 34911 is a better idea.

A number of different proposals are presented by the commenters there; which do you favor? Of course, if the config database gets implemented, then this is kinda moot, but I'm not sure how far off that is.

The code in [[mw:Extension:InterwikiMap]] for parsing and using the contents of the MediaWiki:Interwiki-whitelist might provide inspiration for how to do something similar with the page of questions and answers. Also, some code from [[mw:Extension:ROT13]] might be used, although a stronger encryption algorithm would be needed.

Change 680756 had a related patch set uploaded (by Legoktm; author: Jack Phoenix):

[mediawiki/extensions/ConfirmEdit@master] The mythical on-wiki QuestyCaptcha editor special page

https://gerrit.wikimedia.org/r/680756

A shame that this never picked up the necessary traction. Anyway, my aforementioned patch (which, obviously, nowadays needs rebasing) is available as a standalone* extension called "QuestyCaptchaEditor", though there's a major perf issue that should be handled and the fact that it needs a core hack isn't so great either (but that's a non-issue if the code were to be merged into ConfirmEdit; said core hack is needed only because both ConfirmEdit and QuestyCaptchaEditor set $wgCaptchaClass and core enforces that only one extension may set it and others can't set it afterwards).

* standalone as in "self-contained to the extent that it is possible", it's obviously an extension to ConfirmEdit, which in turn itself is an extension to MediaWiki, so you do the math.