Mostly I agree, but having an unencrypted .xex can help even if it's digitally 
signed. Being able to read code, even in hex or binary, can lead to a later 
exploit but it will probably come the other way around. xex files could prove 
the cleanest way to mod the xbox.

Anyway, does anybody know if it's possible to revert the xbox to fabric default 
settings? It could be useful after a potentially dangerous mod to default.xex. 
Has anyone tried that? (Sorry I won't be able to help with that as I won't buy 
the xbox360. I'm waiting for the PS3:)

> 
> The decryption key for the emulator file (.xex) (if its even 
> encrypted) will have to be stored within the Xbox360 which is a far 
> more feasible place to start looking than attempting to brute force 
> guess it.
> 
> However I doubt having the having the decryption key will be of 
> much help as I would bet money that Microsoft have digitally signed 
> the emulator executables similar to the first Xbox so that if they 
> are modified it will refuse to accept them.
> 
> George,
> 
> PS: I can't remember the length of key they used for the first Xbox 
> but I think I remeber reading somewhere it would take the age of 
> the known universe with the world combined computing power to break 
> it.
> 

-- 
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