What equation suitable for generation of a public key is used for Edwards curve
The problem is the following – info on Edwards Elliptic Curve on Wikipedia page presents an equation
y^2 + x^2 = 1 + d * y^2 * x^2 that doesn't allow us to plot a curve depicted on the first picture.
So, what equation is used for
Ed25519? This one?
y^2 + x^2 = 1 - d * y^2 * x^2
Or this one?
y^2 + x^2 = 1 + d * y^2 * x^2
I haven't found any documentation covering this topic.