A friend and I cowrote a 6th year Hermione vs Diary!Riddle fic on ff.net A Pound of Flesh. Neither is tuned up to HMPOR levels, but we did make them smarter and a bit more inventive than canon, so I thought LWers might enjoy. Trigger warning for violence, some of which is sexualized. And here's a quote:

"I'm listening, Miss Granger. Do you have something to tell me?"
"Just that it would still be stupid and useless for you to torture me. I do know what the prophecy said, you're right, but that's a complicated, detailed piece of information, not a simple yes or no answer. You won't be able to hone in on the content just by playing evil sadist twenty questions. And even if I tell you something, it'll be very hard to tell if I've been precise enough even if I'm not lying. And push me past the true details out of desperation, and you'll get extraneous information that will end up confusing you.
It's not even np-hard – oh, you wouldn't know that phrase. What I mean is that the information is hard to get, and there's no easy way to check whether it's accurate once you've got it. It's not like looking for a puzzle piece in a mess, but having an easy way to check whether it fits. You won't know whether the information I give you is good, though I grant I'll probably say something. So you can torture me, but do me the courtesy of admitting you're doing it because you want to hurt me, not because you want to know the prophecy."