An O(m 2 )-depth quantum algorithm for the elliptic curve discrete logarithm problem over GF(2 m ) a

Abstract

We consider a quantum polynomial-time algorithm which solves the discrete logarithmproblem for points on elliptic curves over GF(2m). We improve over earlier algorithmsby constructing an efficient circuit for multiplying elements of binary finite fields andby representing elliptic curve points using a technique based on projective coordinates.The depth of our proposed implementation, executable in the Linear Nearest Neighbor(LNN) architecture, is O(m2), which is an improvement over the previous bound ofO(m3) derived assuming no architectural restrictions.