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Adding Level Structure to Supersingular Elliptic Curve Isogeny Graphs

open access: yesJournal de théorie des nombres de Bordeaux
In this paper, we add the information of level structure to supersingular elliptic curves and study these objects with the motivation of isogeny-based cryptography. Supersingular elliptic curves with level structure map to Eichler orders in a quaternion algebra, just as supersingular elliptic curves map to maximal orders in a quaternion algebra via the
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On supersingular primes of the Elkies' elliptic curve

open access: yesFunctiones et Approximatio Commentarii Mathematici, 2019
Let $E$ be the elliptic curve $y^2=x^3+(i-2)x^2+x$ over the imaginary quadratic field $\mathbb{Q}(i)$. In this paper, we investigate the supersingular primes of $E$. We introduce the curve $C$ of genus two over $\mathbb{Q}$ covering a quotient of $E$ and for any prime number $p$, we state a condition (over $\mathbb{F}_p$) about the reduction of the ...
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Endomorphism rings of supersingular elliptic curves over $\mathbb{F}_p$

open access: yes, 2019
Let $p>3$ be a fixed prime. For a supersingular elliptic curve $E$ over $\mathbb{F}_p$ with $j$-invariant $j(E)\in \mathbb{F}_p\backslash\{0, 1728\}$, it is well known that the Frobenius map $ =((x,y)\mapsto (x^p, y^p))\in \mathrm{End}(E)$ satisfies $ ^2=-p$. A result of Ibukiyama tells us that $\mathrm{End}(E)$ is a maximal order in $\mathrm{End}(
Li, Songsong, Ouyang, Yi, Xu, Zheng
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