Is this title misleading or linkbait? If so, we should change it as the HN guidelines ask. Would "Two pairs of RSA keys having a common factor found" do? Suggestions for an accurate, neutral title are always welcome.
Edit: We've detached this subthread as off-topic.
Yes, that works. There's potentially a serious RSA keygen issue here, but nobody's broken RSA itself, and the headline does a very poor job of communicating this fact.
I do not know where the key came from, and especially whether it originates from the person who it claims to belong to (other people have found persuasive evidence that this is not the case) but I did find them 'in the wild.' Doubters are encouraged to check for themselves.
So, the current title seems fine. If anything, the question mark is a bit of editorialism.
We sometimes add a question mark when a title is disputed but it isn't clear what a good (i.e. accurate and neutral) title would be. That's the best I've got until someone suggests an accurate and neutral title.