Computing isogenies between elliptic curves over $GF(p^n)$ using Couveignes's algorithm

Abstract : The heart of the improvements of Elkies to Schoof's algorithm for computing the cardinality of elliptic curves over a finite field is the ability to compute isogenies between curves. Elkies' approach is well suited for the case where the characteristic of the field is large. Couveignes showed how to compute isogenies in small characteristic. The aim of this paper is to describe the first successful implementation of Couveignes's algorithm. In particular, we describe the use of fast algorithms for performing incremental operations on series. We also insist on the particular case of the characteristic 2.
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Contributor : Reynald Lercier <>
Submitted on : Sunday, January 11, 2015 - 11:05:15 PM
Last modification on : Wednesday, March 27, 2019 - 4:41:27 PM

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Reynald Lercier, François Morain. Computing isogenies between elliptic curves over $GF(p^n)$ using Couveignes's algorithm. Mathematics of Computation, American Mathematical Society, 2000, 69 (229), pp.351-370. ⟨10.1090/S0025-5718-99-01081-9⟩. ⟨hal-01102025⟩

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