The particular attack is very specific and not really relevant to the implication of the last line in this comment. "One unexpected facet of the attack is that

The particular attack is very specific and not really relevant to the implication of the last line in this comment. "One unexpected facet of the attack is that it uses genus 2 curves to attack elliptic curves (which are genus 1 curves). A connection between the two types of curves is quite unexpected. To give an example illustrating what I mean, for decades people have been trying to attack regular elliptic curve cryptography, including some who have tried using approaches based on genus 2 curves. None of these attempts has succeeded. So for this attempt to succeed in the realm of isogenies is an unexpected development."