Finding Y coordinate

Tiago Mendes on Tue, 05 Nov 2019 16:15:07 +0100

Finding Y coordinate

To: pari-users@pari.math.u-bordeaux.fr
Subject: Finding Y coordinate
From: Tiago Mendes <tiagovazmendes7@gmail.com>
Date: Tue, 5 Nov 2019 15:15:02 +0000
Delivery-date: Tue, 05 Nov 2019 16:15:07 +0100
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Good afternoon,

I am writing a file in C using the PARI C Library and need some help. This is what i want to do:

- Given

—— a prime p, and

—— the coordinate X

i want to obtain the value of Y coordinate from the curve Y^2 = X^3 + 7 (mod p) , knowing for example that Y is positive.

Obrigado,

os meus cumprimentos

Tiago Mendes

Follow-Ups:
- Re: Finding Y coordinate
  - From: Pedro Patricio <pedro@math.uminho.pt>
- Re: Finding Y coordinate
  - From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>

References:
- Elliptic Curve Creation and Scalar Multiplication
  - From: Tiago Mendes <tiagovazmendes7@gmail.com>