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Elliptic curves: for $P = aG$ for some $a$, what is $Q = a^{-1}G$?
Given an elliptic curve group with a generator $G$ where $G$ has a prime order, p.
Given a point $P=aG$ for some unknown $a$. Is it possible to efficiently calculate $Q=a^{-1}G$ without a discrete ...
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