[Resource Topic] 2008/218: Efficient arithmetic on elliptic curves using a mixed Edwards-Montgomery representation

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Title:
Efficient arithmetic on elliptic curves using a mixed Edwards-Montgomery representation

Authors: Wouter Castryck, Steven Galbraith, Reza Rezaeian Farashahi

Abstract:

From the viewpoint of x-coordinate-only arithmetic on elliptic curves, switching between the Edwards model and the Montgomery model is quasi cost-free. We use this observation to speed up Montgomery’s algorithm, reducing the complexity of a doubling step from 2M + 2S to 1M + 3S for suitably chosen curve parameters.

ePrint: https://eprint.iacr.org/2008/218

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