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An important open problem in supersingular isogeny-based cryptography is to produce, without a trusted authority, concrete examples of "hard supersingular curves," that is, concrete supersingular curves for which computing the endomorphism ring is as difficult as it is for random supersingular curves. Or, even better, to produce a hash function to the vertices of the supersingular ℓ-isogeny graph which does not reveal the endomorphism ring, or a path to a curve of known endomorphism ring. SucharXiv:2205.00135v1 fatcat:e3dpuq3cpbhexj46rhjivxs6vu