Let A\/GF(p) and A\u2019\/GF(p) be supersingular principally polarized abelian varieties of dimension g > 1 . For any prime m, we give an algorithm that finds a path in the (m,\u2026,m)-isogeny graph in O(p^(g-1)) group operations on a classical computer, and O(p^((g-1)\/2)) calls to the Grover oracle on a quantum computer. The idea is to find paths from A and A\u2019 to nodes that correspond to products of lower dimensional abelian varieties, and to recurse down in dimension until an elliptic path-finding algorithm (such as Delfs–Galbraith) can be invoked to connect the paths in dimension g=1. In the general case where A\u00a0 and A\u2019 are any two nodes in the graph, this algorithm presents an asymptotic improvement over all of the algorithms in the current literature. In the special case where A\u00a0 and A\u2019 are a known and relatively small number of steps away from each other (as is the case in higher dimensional analogues of SIDH), it gives an asymptotic improvement over the quantum claw finding algorithms and an asymptotic improvement over the classical van Oorschot–Wiener algorithm.<\/p>\n
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Let A\/GF(p) and A\u2019\/GF(p) be supersingular principally polarized abelian varieties of dimension g > 1 . For any prime m, we give an algorithm that finds a path in the (m,\u2026,m)-isogeny graph in O(p^(g-1)) group operations on a classical computer, and O(p^((g-1)\/2)) calls to the Grover oracle on a quantum computer. The idea is to 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