> each game has its own key
> each country version has its own key
>
> each *revision* uses the same key.
>
> different xors are required even for different revisions for each because the
> xors are one big giant hack. this means that if raz gets rid of the board for a
> game/country then no more xors can be produced for that until he gets another
> and the game won't run. this is *not* how things should be with the correct
> decryption keys.
>
> the Sega work in Mame has been done properly, if we find multiple games using
> the same encrypted cpu part (we just found some more smgp revisions) then they
> will work fine without any additional data being required.
>
> As for doing things properly making it too easy to bootleg the new games, I'm
> still not convinced. If CPS2 encryption is half as good as the Sega encryption
> then you can't guess the keys (8k!) without being able to dump decrypted data
> from the boards, and if you can do that you can bootleg them anyway.
>
> hacked xors can be created because the majority of the data is *probably* the
> same and because the xor method is just a giant hack.
>
> as for scam, i'll let you draw your own conclusions, no comment.
>
>
>
> > That would still be some progress in my opinion :) Up untill now Raz has had
> us
> > believe that each game or revision has an entirely different encryption key.
> >
> > > > Thats exactly what I was thinking. There would be no point in making an
> xor
> > > to
> > > > run previously xored program roms run in a different region. But on the
> > other
> > > > hand, I'd imagine some knowledge of the encryption is needed to run
> unxored
> > > > program roms with a hacked xor. It would be nice if someone in the know
> > would
> > > > comment with a little more than just "nope".
> > >
> > > Calling it a hacked XOR could mean anything even just a change to the rom
> > > checksum. Which would probably be required.
> > >
> > > Understanding the encryption wouldn't be required just knowing how the xor's
> > are
> > > applied to make changes to code.
> > >
> > > >
> > > >
> > > > >
> > > > > This line makes me think other wise.
> > > > >
> > > > > "these new XOR's contain incorrect information in relation to what the
> > real
> > > > > encryption would return for many addresses when compared to real
> > hardware."
> > > > >
> > > > > If they were just changing code to alter the region it wouldn't affect
> the
> > > > game.
> > > > > Other than the normal problems of using region codes with some games. I
> > > think
> > > > > what he's getting at is some clone games may use the same encryption
> key.
> > > And
> > > > > since the code would be similar too the XOR works. But different revs.
> or
> > > > > regions will still have code changes that would be incorrect when you
> > apply
> > > an
> > > > > XOR not made for it.
> > > > >
> > > > > If this is true it leads me to speculate that the key could be quite
> small
> > > if
> > > > > there's a lot of games that work like this. The remaining games could be
> > > brute
> > > > > forced easily if the algorithm was known.
> > > > >
> > > > > Consider this why would someone bother hacking XOR's to do a region
> switch
> > > > when
> > > > > most CPS2 emu's support region switching. And why would Raz comment on
> > > > something
> > > > > that pathetic? Really no one would care.
> > > > >
> > > >
> > >
> >
>
>
> Tell Me Why You're Here, I Came To Disappear
> http://haze.mame.net/
>




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