The infinity of public key math

[ElDalmatino]

I wonder why it is not possible to calculate, or is my brain freezing, public key calculation goes in a infinity loop i know it adding substraction ... end in changing 02 in 03 and 03 in 02 when you hit the red thin line.

But (now comes the BUT) i watch the math calculation of AlbertoBSD, and in some point, there is a number 200000000..... it's the break between the loops of infinity, or do i see things wrong.

[GR Sasa]

I think you need to read more about Finite field.

[NotATether]

But (now comes the BUT) i watch the math calculation of AlbertoBSD, and in some point, there is a number 200000000..... it's the break between the loops of infinity, or do i see things wrong.

It looks like Alberto is using the long 0 value to represent the point at infinity.

The point (0, 0) is not technically the point at infinity, so if you want to represent it in a mathematically proper way, don't use affine coordinates "x, y", You would have to use progressive coordinates or Jacobian coordinates as shown here: https://crypto.stackexchange.com/questions/75002/how-to-represent-the-point-at-infinityelliptic-curves-in-code

[ElDalmatino]

You should all be right, thx for helping me understand some things.