Figuring out the encryption key's totally different from xoring (which I've always understood to be sort of like an ips patch more than anything). The xor's specific to each revision and can only translate that specific encrypted dump into decrypted data of the same revision. Trying to apply the xor of one revision to a different revision wouldn't just decrypt the other revision. Any of the emu-wizes know if this case?


> >...but it might mean that different revisions of the
> > same game have the same or similar encryption key.
>
> that is exactly what it means. I believe to remember quite well one of the first
> things we found out when cps2shock started releasing Excel tables of parts of
> the unencrypted Street Fighter Alpha roms (long before the time of XOR's).
> And that was that that different revisions boards of the same game use the same
> encryption. It's described in Report 2 on aforementioned page.
>