[Cryptography] Mathematics of variable substitutions?

[Bill Cox]

On Sat, Apr 30, 2016 at 4:17 AM, Bill Cox <waywardgeek at gmail.com> wrote:

>
>     x2 = -(x^4 + 2x^2 - 1)/(x^4 - 2x^2 - 1)
>

This is only for d == -1, which is a simplification I've been using.  For d
!= 1, the equation is:

(-d x^4 + 2x^2 - 1)/(d x^4 - 2d x^2 + 1)

Bill

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