1. It is known that SEA (Schoof Elkies Atkin) algorithm is recently the most efficient method to calculate the orders of elliptic curves over Fp. Isogeny cycles method made by Morain is an important local optimized technique to improve SEA algorithm.
SEA（SchoofElkiesAtkin）算法是计算椭圆曲线阶的有效算法，同种圈（isogenycycles）方法是Morain对SEA算法改善的一种重要局部优化技术。