All I really need is the way to get the second key. I've gotten the first layer decrypted but not the second

I got Forza 5 and now I realllyyyy want swaps in GT6. Chassis swaps mainly, that's why I want to get it decrypted haha. I know I have no chance at hacking an xbox, let alone the xbox one lol.
For those of you with a CFW Ps3, this may help in finding the second key.
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Originally posted by another user
Attention! Some game developers (for example, creators of Metal Gear Solid 4) uses a custom additional encryption layer for their save files. In these cases you need to reverse-engineer the game itself.
and read everything that's there.