I have started a binge of wikignome minor edits to upgrade http links to https, where appropriate. On the Main_Page, via Template:MainPage_FAQ, there is a link to http://en.wikipedia.org/wiki/Public-key_cryptography (plain http). In place of that link, the source of Template:MainPage_FAQ says this:
A check of the Mediawiki Manual:Interwiki indicates that changing the target requires either editing the SQL of the wiki’s database, or appropriately using an Interwiki extension if one is installed. Obviously, this tiny fix is far above my access level.
It is good that once the Interwiki link is fixed, it will automagically fix all links using that format. After Interwiki links are made https, I will then go around changing hardcoded Wikipedia links to the Interwiki format.
Thanks!
Edit: Other Interwikis also need to be fixed; e.g. in the Main_Page itself, this also outputs a plain http link:
Somebody with appropriate access should upgrade them all to https, please.