[Resource Topic] 2023/1766: Introducing Clapoti(s): Evaluating the isogeny class group action in polynomial time

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Title:
Introducing Clapoti(s): Evaluating the isogeny class group action in polynomial time

Authors: Aurel Page, Damien Robert

Abstract:

In this short note, we present a simplified (but slower) version Clapoti of Clapotis, whose full description will appear later. Let 𝐸/𝔽_𝑞 be an elliptic curve with an effective primitive orientation by a quadratic imaginary order 𝑅 ⊂ End(𝐸). Let 𝔞 be an invertible ideal in 𝑅. Clapoti is a randomized polynomial time algorithm in 𝑂 ((log Δ_𝑅 + log 𝑞)^𝑂(1) ) operations to compute the class group action 𝐸 ↦ 𝐸_𝔞 ≃ 𝐸/𝐸[𝔞].

ePrint: https://eprint.iacr.org/2023/1766

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