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Quelles courbes elliptiques pour la cryptographie ? - Institut de ...

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En pratique<br />

idéaux ⇐⇒ formes quadratiques (réduites) ax 2 + bx + c <strong>de</strong><br />

discriminant d et τ = b+√ −d<br />

2a<br />

.<br />

Evaluation <strong>de</strong>s j (Enge) :<br />

1 utilisation <strong>de</strong><br />

η = q 1/24 (1 +<br />

2 évaluation multi-points.<br />

∞∑<br />

(−1) n (q n(3n−1)/2 + q n(3n+1)/2 )).<br />

n=1<br />

Christophe Ritzenthaler () <strong>Quelles</strong> <strong>courbes</strong> <strong>elliptiques</strong> <strong>pour</strong> <strong>la</strong> <strong>cryptographie</strong> ? 19 mars 2008 26 / 31

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