Welcome to the resource topic for 2013/692
Title:
Faster Compact Diffie-Hellman: Endomorphisms on the x-line
Authors: Craig Costello, Huseyin Hisil, Benjamin Smith
Abstract:Abstract: We describe an implementation of fast elliptic curve scalar multiplication, optimized for Diffie–Hellman Key Exchange at the 128-bit security level. The algorithms are compact (using only x-coordinates), run in constant time with uniform execution patterns, and do not distinguish between the curve and its quadratic twist; they thus have a built-in measure of side-channel resistance. (For comparison, we also implement two faster but non-constant-time algorithms.) The core of our construction is a suite of two-dimensional differential addition chains driven by efficient endomorphism decompositions, built on curves selected from a family of Q-curve reductions over F_{p^2} with p = 2^{127}-1. We include state-of-the-art experimental results for twist-secure, constant-time, x-coordinate-only scalar multiplication.
ePrint: https://eprint.iacr.org/2013/692
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