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2010

Choosing the correct elliptic curve in the CM method

12 years 11 months ago
Choosing the correct elliptic curve in the CM method
We give an elementary way to distinguish between the twists of an ordinary elliptic curve E over Fp in order to identify the one with p+1-2U points, when p = U2 + dV 2 with 2U, 2V Z and E is constructed using the CM method for finding elliptic curves with a prescribed number of points. Our algorithms consist in most cases of reading off simple congruence conditions on U and V modulo 4.
Karl Rubin, Alice Silverberg
Added 20 May 2011
Updated 20 May 2011
Type Journal
Year 2010
Where MOC
Authors Karl Rubin, Alice Silverberg
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