Answer by Yehuda Lindell for worst-case OWF from weak OWF
In order to answer this question, you first really need to define what a worst-case OWF is. In particular, is it possible to efficiently sample a hard instance? I assume not, because this would be very...
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A function $f$ is a worst-case OWF if there is no adversary $\mathcal{A}$ such that $$\forall x,Pr[y=f(x): f(\mathcal{A}(y))=y]=1$$A weak OWF is a function that the probability of inverting it is...
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