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by mti 4179 days ago
It certainly depends on the precise arithmetic being used, but for the usual complete addition law, for example, I'm pretty sure I can recover k from the computation of [k]P where P is of the form (0,y) (or (0:Y:1) in the projective case) and not on the curve. That's a cute idea for a paper that I'll probably write up, by the way; thanks!