Quote from: NotATether on Today at 03:44:36 AM

Quote from: Tanagi on Today at 03:24:51 AM

If L = (y2 - y1) / (x2 - x1) what does 1 / (x2 - x1) mean?

It means that you take the result of x2 - x1 = xdiff, and then raise it to the (p-2)th power: xdiff^p-2 mod p. (xdiff^p-1 % p would be equal to 1, while xdiff^p % p is simply xdiff) where p is the curve characteristic.

It's just a shorthand way of writing the above expression as division doesn't really exist in elliptic curves but modular inverses do.

I get this

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It means that you take the result of x2 - x1 = xdiff

but I totally don't uderstand this

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then raise it to the (p-2)th power: xdiffp-2 mod p. (xdiffp-1 % p would be equal to 1

I need this explained in the simplest possible terms please.

That's why I asked for a step by step breakdown (every step) would be much appreciated.