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Important meaning; where the most research is being focussed. Maybe because a break-though seems possible or a break-through would have big consequences.

Any questions that are being researched vigorously?

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closed as primarily opinion-based by Squeamish Ossifrage, AleksanderRas, e-sushi, Maeher, Henrick Hellström Jun 16 at 17:40

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ If you'd asked a few week back, I'd have said NIZKs from worst-case assumptions. But this was recently solved by Peikert and Sheihan: eprint.iacr.org/2019/158. $\endgroup$ – Occams_Trimmer Jun 6 at 15:32
  • $\begingroup$ @Occams_Trimmer Would a new open question be efficient NIZKs from worse case assumptions? $\endgroup$ – WeCanBeFriends Jun 6 at 15:35