* Meaning the way we calculate the shared secret
* They get M = (G * x_us) * b_0, they calc the secret with M * x_them
* M * x_them = G * x_us * b_ * x_them
* We have H = (G * x_them), we calc with H * (x_us * b_0 mod n))
* H * (x_us * b_0) = G * x_them * x_us * b_0